[gnome-panel] menu: redo get_file_root

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 4e45b2ad295053ef5f3fe175fb5592ad03a211c3
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Mar 21 00:19:03 2021 +0200

    menu: redo get_file_root
    
    Coverity thinks that we are freeing file. Redo function to avoid
    multiple false positive defects.
    
    Coverity CID: #1502699, #1502700, #1502703, #1502705

 modules/menu/gp-menu-utils.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)
---
diff --git a/modules/menu/gp-menu-utils.c b/modules/menu/gp-menu-utils.c
index 5477e419a..273db690b 100644
--- a/modules/menu/gp-menu-utils.c
+++ b/modules/menu/gp-menu-utils.c
@@ -78,15 +78,20 @@ static GFile *
 get_file_root (GFile *file)
 {
   GFile *parent;
+  GFile *root;
+
+  parent = g_file_get_parent (file);
+  if (parent == NULL)
+    return g_object_ref (file);
 
-  g_object_ref (file);
-  while ((parent = g_file_get_parent (file)) != NULL)
+  root = parent;
+  while ((parent = g_file_get_parent (root)) != NULL)
     {
-      g_object_unref (file);
-      file = parent;
+      g_object_unref (root);
+      root = parent;
     }
 
-  return file;
+  return root;
 }
 
 static gchar *