[mutter] core: Fix task leak in meta_selection_source_memory_read_async

[Robert Mader <rmader src gnome org>]

commit 98040e67a2eaf8740c93da1a35f131e1130ddc4f
Author: Sebastian Keller <skeller gnome org>
Date:   Thu Jan 30 14:37:57 2020 +0100

    core: Fix task leak in meta_selection_source_memory_read_async
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/1001

 src/core/meta-selection-source-memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/core/meta-selection-source-memory.c b/src/core/meta-selection-source-memory.c
index c8b0c83f5..a52f50861 100644
--- a/src/core/meta-selection-source-memory.c
+++ b/src/core/meta-selection-source-memory.c
@@ -43,7 +43,7 @@ meta_selection_source_memory_read_async (MetaSelectionSource *source,
 {
   MetaSelectionSourceMemory *source_mem = META_SELECTION_SOURCE_MEMORY (source);
   GInputStream *stream;
-  GTask *task;
+  g_autoptr (GTask) task = NULL;
 
   if (g_strcmp0 (mimetype, source_mem->mimetype) != 0)
     {