[gnome-builder] tree: fix missing return

[Christian Hergert <chergert src gnome org>]

commit b26dfee2306a4294c07b9faed4c444f279e11237
Author: Christian Hergert <christian hergert me>
Date:   Sat Apr 11 12:35:39 2015 -0700

    tree: fix missing return

 src/tree/gb-tree-node.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/tree/gb-tree-node.c b/src/tree/gb-tree-node.c
index e19f356..27e4b69 100644
--- a/src/tree/gb-tree-node.c
+++ b/src/tree/gb-tree-node.c
@@ -734,6 +734,8 @@ cleanup:
   g_object_unref (popreq->self);
   g_object_unref (popreq->popover);
   g_free (popreq);
+
+  return G_SOURCE_REMOVE;
 }
 
 void