net: vlan: fix up vlan_proto_idx() for CONFIG_BUG=n

Add missing return statement for CONFIG_BUG=n.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index abc9cb631c47..ba5983f34c42 100644
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -121,6 +121,7 @@ static inline unsigned int vlan_proto_idx(__be16 proto)
                 return VLAN_PROTO_8021AD;
         default:
                 BUG();
+                return 0;
         }
 }