python: fix -Wsign-compare warnings

Specifically:
xen/lowlevel/xc/xc.c: In function ‘pyxc_domain_create’:
xen/lowlevel/xc/xc.c:147:24: error: comparison of integer expressions of different signedness: ‘int’ and ‘long unsigned int’ [-Werror=sign-compare]
  147 |         for ( i = 0; i < sizeof(xen_domain_handle_t); i++ )
      |                        ^
xen/lowlevel/xc/xc.c: In function ‘pyxc_domain_sethandle’:
xen/lowlevel/xc/xc.c:312:20: error: comparison of integer expressions of different signedness: ‘int’ and ‘long unsigned int’ [-Werror=sign-compare]
  312 |     for ( i = 0; i < sizeof(xen_domain_handle_t); i++ )
      |                    ^
xen/lowlevel/xc/xc.c: In function ‘pyxc_domain_getinfo’:
xen/lowlevel/xc/xc.c:391:24: error: comparison of integer expressions of different signedness: ‘int’ and ‘long unsigned int’ [-Werror=sign-compare]
  391 |         for ( j = 0; j < sizeof(xen_domain_handle_t); j++ )
      |                        ^
xen/lowlevel/xc/xc.c: In function ‘pyxc_get_device_group’:
xen/lowlevel/xc/xc.c:677:20: error: comparison of integer expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned int’} [-Werror=sign-compare]
  677 |     for ( i = 0; i < num_sdevs; i++ )
      |                    ^
xen/lowlevel/xc/xc.c: In function ‘pyxc_physinfo’:
xen/lowlevel/xc/xc.c:988:20: error: comparison of integer expressions of different signedness: ‘int’ and ‘long unsigned int’ [-Werror=sign-compare]
  988 |     for ( i = 0; i < sizeof(pinfo.hw_cap)/4; i++ )
      |                    ^
xen/lowlevel/xc/xc.c:994:20: error: comparison of integer expressions of different signedness: ‘int’ and ‘long unsigned int’ [-Werror=sign-compare]
  994 |     for ( i = 0; i < ARRAY_SIZE(virtcaps_bits); i++ )
      |                    ^
xen/lowlevel/xc/xc.c:998:24: error: comparison of integer expressions of different signedness: ‘int’ and ‘long unsigned int’ [-Werror=sign-compare]
  998 |         for ( i = 0; i < ARRAY_SIZE(virtcaps_bits); i++ )
      |                        ^
xen/lowlevel/xs/xs.c: In function ‘xspy_ls’:
xen/lowlevel/xs/xs.c:191:23: error: comparison of integer expressions of different signedness: ‘int’ and ‘unsigned int’ [-Werror=sign-compare]
  191 |         for (i = 0; i < xsval_n; i++)
      |                       ^
xen/lowlevel/xs/xs.c: In function ‘xspy_get_permissions’:
xen/lowlevel/xs/xs.c:297:23: error: comparison of integer expressions of different signedness: ‘int’ and ‘unsigned int’ [-Werror=sign-compare]
  297 |         for (i = 0; i < perms_n; i++) {
      |                       ^
cc1: all warnings being treated as errors

Use size_t for loop iterators where it's compared with sizeof() or
similar construct.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/python/xen/lowlevel/xc/xc.c

@@ -117,7 +117,8 @@ static PyObject *pyxc_domain_create(XcObject *self,
                                     PyObject *kwds)
 {
     uint32_t dom = 0, target = 0;
-    int      ret, i;
+    int      ret;
+    size_t   i;
     PyObject *pyhandle = NULL;
     struct xen_domctl_createdomain config = {
         .handle = {
@@ -295,7 +296,7 @@ static PyObject *pyxc_vcpu_setaffinity(XcObject *self,
 
 static PyObject *pyxc_domain_sethandle(XcObject *self, PyObject *args)
 {
-    int i;
+    size_t i;
     uint32_t dom;
     PyObject *pyhandle;
     xen_domain_handle_t handle;
@@ -336,7 +337,8 @@ static PyObject *pyxc_domain_getinfo(XcObject *self,
     PyObject *list, *info_dict, *pyhandle;
 
     uint32_t first_dom = 0;
-    int max_doms = 1024, nr_doms, i, j;
+    int max_doms = 1024, nr_doms, i;
+    size_t j;
     xc_dominfo_t *info;
 
     static char *kwd_list[] = { "first_dom", "max_doms", NULL };
@@ -631,7 +633,8 @@ static PyObject *pyxc_get_device_group(XcObject *self,
 {
     uint32_t sbdf;
     uint32_t max_sdevs, num_sdevs;
-    int domid, seg, bus, dev, func, rc, i;
+    int domid, seg, bus, dev, func, rc;
+    size_t i;
     PyObject *Pystr;
     char *group_str;
     char dev_str[9];
@@ -971,7 +974,7 @@ static PyObject *pyxc_physinfo(XcObject *self)
 {
     xc_physinfo_t pinfo;
     char cpu_cap[128], virt_caps[128], *p;
-    int i;
+    size_t i;
     const char *virtcap_names[] = { "hvm", "pv" };
     const unsigned virtcaps_bits[] = { XEN_SYSCTL_PHYSCAP_hvm,
                                        XEN_SYSCTL_PHYSCAP_pv };

tools/python/xen/lowlevel/xs/xs.c

@@ -186,7 +186,7 @@ static PyObject *xspy_ls(XsHandle *self, PyObject *args)
     Py_END_ALLOW_THREADS
 
     if (xsval) {
-        int i;
+        size_t i;
         PyObject *val = PyList_New(xsval_n);
         for (i = 0; i < xsval_n; i++)
 #if PY_MAJOR_VERSION >= 3
@@ -276,7 +276,7 @@ static PyObject *xspy_get_permissions(XsHandle *self, PyObject *args)
     struct xs_handle *xh = xshandle(self);
     struct xs_permissions *perms;
     unsigned int perms_n = 0;
-    int i;
+    size_t i;
 
     xs_transaction_t th;
     char *thstr;