mac802154: fix kbuild test robot warning

Author: Alexander Aring <alex.aring@gmail.com>

This patch fixs the following kbuild test robot warning:

coccinelle warnings: (new ones prefixed by >>)

>> net/mac802154/cfg.c:53:1-3: WARNING: PTR_ERR_OR_ZERO can be used

Signed-off-by: Alexander Aring 
Signed-off-by: Marcel Holtmann 
---
 net/mac802154/cfg.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
 
diff --git a/net/mac802154/cfg.c b/net/mac802154/cfg.c
index 7d31da5..5d9f68c 100644
--- a/net/mac802154/cfg.c
+++ b/net/mac802154/cfg.c
@@ -51,10 +51,7 @@ ieee802154_add_iface(struct wpan_phy *phy, const char *name,
 	struct net_device *err;
 
 	err = ieee802154_if_add(local, name, type, extended_addr);
-	if (IS_ERR(err))
-		return PTR_ERR(err);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(err);
 }
 
 static int