libxl: make one function static

libxl__device_frontend_path() is used in libxl_device.c only. Make it
static.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>

tools/libxl/libxl_device.c

@@ -18,7 +18,7 @@
 
 #include "libxl_internal.h"
 
-char *libxl__device_frontend_path(libxl__gc *gc, libxl__device *device)
+static char *libxl__device_frontend_path(libxl__gc *gc, libxl__device *device)
 {
     char *dom_path = libxl__xs_get_dompath(gc, device->domid);
 

tools/libxl/libxl_internal.h

@@ -1206,7 +1206,6 @@ _hidden int libxl__device_exists(libxl__gc *gc, xs_transaction_t t,
 _hidden int libxl__device_generic_add(libxl__gc *gc, xs_transaction_t t,
         libxl__device *device, char **bents, char **fents, char **ro_fents);
 _hidden char *libxl__device_backend_path(libxl__gc *gc, libxl__device *device);
-_hidden char *libxl__device_frontend_path(libxl__gc *gc, libxl__device *device);
 _hidden char *libxl__device_libxl_path(libxl__gc *gc, libxl__device *device);
 _hidden int libxl__parse_backend_path(libxl__gc *gc, const char *path,
                                       libxl__device *dev);