mtd: simplify return logic in do_map_probe()

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/mtd/chips/chipreg.c b/drivers/mtd/chips/chipreg.c
index da1f96f..0bbc61b 100644
--- a/drivers/mtd/chips/chipreg.c
+++ b/drivers/mtd/chips/chipreg.c
@@ -76,10 +76,7 @@
 	*/
 	module_put(drv->module);
 
-	if (ret)
-		return ret;
-
-	return NULL;
+	return ret;
 }
 /*
  * Destroy an MTD device which was created for a map device.