[gimp] app: fix memory leak in gimp_image_merge_layers()

[N/A <ell src gnome org>]

commit 3f7b135a2a5e468149b873974a93e65340ff0451
Author: Ell <ell_se yahoo com>
Date:   Sun Apr 23 10:50:42 2017 -0400

    app: fix memory leak in gimp_image_merge_layers()

 app/core/gimpimage-merge.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/app/core/gimpimage-merge.c b/app/core/gimpimage-merge.c
index a6f8675..236e99c 100644
--- a/app/core/gimpimage-merge.c
+++ b/app/core/gimpimage-merge.c
@@ -512,7 +512,11 @@ gimp_image_merge_layers (GimpImage     *image,
     }
 
   if ((x2 - x1) == 0 || (y2 - y1) == 0)
-    return NULL;
+    {
+      g_slist_free (reverse_list);
+
+      return NULL;
+    }
 
   /*  Start a merge undo group. */