[mutter] x11-selection: Plug potential GInputStream leak

[Robert Mader <rmader src gnome org>]

commit 861e5caf8cc80e19f7aef5560265861d41fa10b5
Author: Sebastian Keller <skeller src gnome org>
Date:   Sat Jan 11 03:57:04 2020 +0100

    x11-selection: Plug potential GInputStream leak
    
    The stream was not freed in the error case. I have never observed this
    one in practice though.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/1001

 src/x11/meta-selection-source-x11.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/x11/meta-selection-source-x11.c b/src/x11/meta-selection-source-x11.c
index 55e500327..c9fc8fbc6 100644
--- a/src/x11/meta-selection-source-x11.c
+++ b/src/x11/meta-selection-source-x11.c
@@ -190,6 +190,7 @@ read_mimetypes_cb (GInputStream *stream,
     {
       g_task_return_error (task, error);
       g_object_unref (task);
+      g_object_unref (stream);
       return;
     }