[gcompris] shapegame: fixed a potential crash when a piece was overwritten by another in their wrong position.

[Bruno Coudoin <bcoudoin src gnome org>]

commit 0f7d315269b738251aa4372d3e4716ee417bf830
Author: Bruno Coudoin <bruno coudoin free fr>
Date:   Thu Jul 14 08:15:32 2011 +0200

    shapegame: fixed a potential crash when a piece was overwritten by another in their wrong position.

 src/babymatch-activity/shapegame.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/babymatch-activity/shapegame.c b/src/babymatch-activity/shapegame.c
index 2aeb887..c386579 100644
--- a/src/babymatch-activity/shapegame.c
+++ b/src/babymatch-activity/shapegame.c
@@ -939,11 +939,12 @@ item_event_drag(GooCanvasItem *item,
 	{
 	case SHAPE_TARGET:
 	  /* unplace this shape */
-	  if (shape->placed && shape->placed->target_point)
+	  if (shape->placed && shape->placed->target_point) {
 	    g_object_set (shape->placed->target_point, "visibility",
 			  GOO_CANVAS_ITEM_VISIBLE, NULL);
-	  shape->placed->shape_place = NULL;
-	  shape->placed = NULL;
+	    shape->placed->shape_place = NULL;
+	    shape->placed = NULL;
+	  }
 	  /* No break on purpose */
 	case SHAPE_ICON:
 	  gc_drag_offset_save(event);