tools/libs/call: Avoid xc_memalign in netbsd and solaris backends

These are already arch specific, so just use the appropriate
interfaces (as determined by looking at the xc_memalign backend).

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>

tools/libs/call/netbsd.c

@@ -74,8 +74,8 @@ void *osdep_alloc_hypercall_buffer(xencall_handle *xcall, size_t npages)
     size_t size = npages * XC_PAGE_SIZE;
     void *p;
 
-    p = xc_memalign(xcall, XC_PAGE_SIZE, size);
-    if (!p)
+    ret = posix_memalign(&p, XC_PAGE_SIZE, size);
+    if ( ret != 0 || !p )
         return NULL;
 
     if ( mlock(p, size) < 0 )

tools/libs/call/solaris.c

@@ -71,7 +71,7 @@ int osdep_xencall_close(xencall_handle *xcall)
 
 void *osdep_alloc_hypercall_buffer(xencall_handle *xcall, size_t npages)
 {
-    return xc_memalign(xcall, XC_PAGE_SIZE, npages * XC_PAGE_SIZE);
+    return memalign(XC_PAGE_SIZE, npages * XC_PAGE_SIZE);
 }
 
 void osdep_free_hypercall_buffer(xencall_handle *xcall, void *ptr,