[totem] backend: Fix compile-time warning

[Bastien Nocera <hadess src gnome org>]

commit 68bc6fdb3ec9a8a91b82f508b4f9f2ca1b0851cd
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Mar 16 16:13:01 2016 +0100

    backend: Fix compile-time warning
    
    The function returns a boolean, not a pointer.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=763759

 src/backend/bacon-video-widget.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/backend/bacon-video-widget.c b/src/backend/bacon-video-widget.c
index 53da35f..a8a7301 100644
--- a/src/backend/bacon-video-widget.c
+++ b/src/backend/bacon-video-widget.c
@@ -5935,7 +5935,7 @@ navigation_event (ClutterActor *actor,
   gfloat x, y;
 
   if (frame == NULL)
-    return NULL;
+    return CLUTTER_EVENT_PROPAGATE;
 
   /* Get event coordinates into the actor's coordinates. */
   clutter_event_get_coords (event, &x, &y);