[clutter/clutter-1.18] gesture-action: fix memory corruption

[Lionel Landwerlin <llandwerlin src gnome org>]

commit 97724939c8de004d7fa230f3ff64862d957f93a9
Author: Lionel Landwerlin <llandwerlin gmail com>
Date:   Tue Oct 15 18:23:46 2013 +0100

    gesture-action: fix memory corruption
    
    abcf1d589f29ba7914d5648bb9814ad26c13cd83 introduced a crasher because
    the 'point' variable points to a piece of memory that is being
    reallocated by the begin_gesture (by a g_array_set_size) call 5 lines
    before.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=710227

 clutter/clutter-gesture-action.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/clutter/clutter-gesture-action.c b/clutter/clutter-gesture-action.c
index 6a116d0..09324f4 100644
--- a/clutter/clutter-gesture-action.c
+++ b/clutter/clutter-gesture-action.c
@@ -396,11 +396,15 @@ stage_captured_event_cb (ClutterActor       *stage,
               return CLUTTER_EVENT_PROPAGATE;
             }
 
-          if (!begin_gesture(action, actor))
+          if (!begin_gesture (action, actor))
             {
-              gesture_update_motion_point (point, event);
+              if ((point = gesture_find_point (action, event, &position)) != NULL)
+                gesture_update_motion_point (point, event);
               return CLUTTER_EVENT_PROPAGATE;
             }
+
+          if ((point = gesture_find_point (action, event, &position)) == NULL)
+            return CLUTTER_EVENT_PROPAGATE;
         }
 
       gesture_update_motion_point (point, event);