libxl: export some functions for pvusb use

Signed-off-by: Chunyan Liu <cyliu@suse.com>
Signed-off-by: Simon Cao <caobosimon@gmail.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Jackson <Ian.Jackson@eu.citrix.com>

tools/libxl/libxl.c

@@ -1966,7 +1966,7 @@ out:
 }
 
 /* common function to get next device id */
-static int libxl__device_nextid(libxl__gc *gc, uint32_t domid, char *device)
+int libxl__device_nextid(libxl__gc *gc, uint32_t domid, char *device)
 {
     char *dompath, **l;
     unsigned int nb;
@@ -1985,8 +1985,7 @@ static int libxl__device_nextid(libxl__gc *gc, uint32_t domid, char *device)
     return nextid;
 }
 
-static int libxl__resolve_domid(libxl__gc *gc, const char *name,
-                                uint32_t *domid)
+int libxl__resolve_domid(libxl__gc *gc, const char *name, uint32_t *domid)
 {
     if (!name)
         return 0;

tools/libxl/libxl_internal.h

@@ -1180,6 +1180,9 @@ _hidden int libxl__init_console_from_channel(libxl__gc *gc,
                                              libxl__device_console *console,
                                              int dev_num,
                                              libxl_device_channel *channel);
+_hidden int libxl__device_nextid(libxl__gc *gc, uint32_t domid, char *device);
+_hidden int libxl__resolve_domid(libxl__gc *gc, const char *name,
+                                 uint32_t *domid);
 
 /*
  * For each aggregate type which can be used as an input we provide: