evas-object-main: Fix null dereference

Coverity reports that EVAS_OBJECT_DATA_SAFE_GET returns NULL here (184
out of 188 times). The _all_animation_objects_cancel function
directly dereferences the obj parameter passed into it, so lets null check it
before calling that function.

Fixes Coverity CID1381711

@fix

Signed-off-by: Chris Michael <cp.michael@samsung.com>

src/lib/evas/canvas/evas_object_main.c

@@ -2840,7 +2840,7 @@ _efl_canvas_object_event_animation_cancel(Eo *eo_obj)
 {
    Evas_Object_Protected_Data *obj = EVAS_OBJECT_DATA_SAFE_GET(eo_obj);
 
-   _all_animation_objects_cancel(obj);
+   if (obj) _all_animation_objects_cancel(obj);
 }