[mutter] wayland: Fix c&p typo in wl_listener notify callback

[Carlos Garnacho <carlosg src gnome org>]

commit d6a7559750b0c849979f279f3219c86ffb10a064
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri May 1 18:50:06 2015 +0200

    wayland: Fix c&p typo in wl_listener notify callback
    
    The corresponding wl_notify field for destroy_data_device_icon()
    is drag_grab->drag_icon_listener, otherwise we're fetching a pointer
    that's slightly off where we want.

 src/wayland/meta-wayland-data-device.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/wayland/meta-wayland-data-device.c b/src/wayland/meta-wayland-data-device.c
index 16f626d..4c07298 100644
--- a/src/wayland/meta-wayland-data-device.c
+++ b/src/wayland/meta-wayland-data-device.c
@@ -371,7 +371,7 @@ static void
 destroy_data_device_icon (struct wl_listener *listener, void *data)
 {
   MetaWaylandDragGrab *drag_grab =
-    wl_container_of (listener, drag_grab, drag_data_source_listener);
+    wl_container_of (listener, drag_grab, drag_icon_listener);
 
   drag_grab->drag_surface = NULL;