[mutter/gnome-3-36] group: Free group if returning early

[Robert Mader <rmader src gnome org>]

commit fdb76593d028fedebdf2a5a51406e05f24716b4e
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Tue Jul 9 11:17:18 2019 +0200

    group: Free group if returning early
    
    If we get an error when fetching the window attributes, the group isn't ever
    free'd, so use an autopointer instead, releasing the stolen one.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/1195
    
    (cherry picked from commit 1d75d5aa2f5e5a7b14573489877e143f6a06cf5d)

 src/x11/group.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/x11/group.c b/src/x11/group.c
index a3227467fc..60f2d29026 100644
--- a/src/x11/group.c
+++ b/src/x11/group.c
@@ -41,7 +41,7 @@ static MetaGroup*
 meta_group_new (MetaX11Display *x11_display,
                 Window          group_leader)
 {
-  MetaGroup *group;
+  g_autofree MetaGroup *group = NULL;
 #define N_INITIAL_PROPS 3
   Atom initial_props[N_INITIAL_PROPS];
   int i;
@@ -91,7 +91,7 @@ meta_group_new (MetaX11Display *x11_display,
               "Created new group with leader 0x%lx\n",
               group->group_leader);
 
-  return group;
+  return g_steal_pointer (&group);
 }
 
 static void