ivi_layout_surface_add_notification: Fix potential leak of memory pointed to by 'notification'

Signed-off-by: Lucas Tanure <tanure@linux.com>
Reviewed-by: Bryce Harrington <bryce@osg.samsung.com>

ivi-shell/ivi-layout.c

@@ -1532,6 +1532,7 @@ ivi_layout_surface_add_notification(struct ivi_layout_surface *ivisurf,
 	prop_callback = malloc(sizeof *prop_callback);
 	if (prop_callback == NULL) {
 		weston_log("fails to allocate memory\n");
+		free(notification);
 		return IVI_FAILED;
 	}