evas: fix memory leak in evas_object_image_render_pre.

Summary:
Eina_Rectangles are removed from pixel_updates list without eina_rectangle_free during render pre stage.

@fix

Test Plan: check memory leak.

Reviewers: cedric, jypark

Subscribers: jypark, cedric

Differential Revision: https://phab.enlightenment.org/D3006

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>

src/lib/evas/canvas/evas_object_image.c

@@ -3837,6 +3837,7 @@ evas_object_image_render_pre(Evas_Object *eo_obj,
                                  idx += idw;
                                  idy = ydy;
                               }
+                            eina_rectangle_free(rr);
                          }
                     }
                   EINA_COW_PIXEL_WRITE_END(o, pixi_write);