[metacity] xprops: fix memory leak

[Alberts Muktupāvels <muktupavels src gnome org>]

commit c87f73f3b4413720a2f3e6a672826d3fec7f77a9
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Aug 6 23:47:27 2019 +0300

    xprops: fix memory leak
    
    XmbTextPropertyToTextList documentation says that XFreeStringList
    should be used to free the storage for the list and its contents.
    
    https://gitlab.gnome.org/GNOME/metacity/issues/7

 src/core/xprops.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/src/core/xprops.c b/src/core/xprops.c
index a1cd901f..4b701af7 100644
--- a/src/core/xprops.c
+++ b/src/core/xprops.c
@@ -674,19 +674,21 @@ text_property_to_utf8 (Display             *xdisplay,
 
   res = XmbTextPropertyToTextList (xdisplay, prop, &local_list, &count);
   if (res == XNoMemory || res == XLocaleNotSupported || res == XConverterNotFound)
-    goto out;
+    return NULL;
 
   if (count == 0)
-    goto out;
+    {
+      XFreeStringList (local_list);
+      return NULL;
+    }
 
   if (g_get_charset (&charset))
     ret = g_strdup (local_list[0]);
   else
     ret = g_convert (local_list[0], -1, "UTF-8", charset, NULL, NULL, NULL);
 
-  out:
-    meta_XFree (local_list);
-    return ret;
+  XFreeStringList (local_list);
+  return ret;
 }
 
 static gboolean