mac80211: cancel mesh path timer

The mesh path timer needs to be canceled when
leaving the mesh as otherwise it could fire
after the interface has been removed already.

Cc: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index d60b3d3..8557235 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -622,6 +622,7 @@
 
 	del_timer_sync(&sdata->u.mesh.housekeeping_timer);
 	del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
+	del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 	/*
 	 * If the timer fired while we waited for it, it will have
 	 * requeued the work. Now the work will be running again