8021q: Convert uses of __constant_<foo> to <foo>

The use of __constant_<foo> has been unnecessary for quite awhile now.

Make these uses consistent with the rest of the kernel.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h
index 5704ed9..9d010a09 100644
--- a/net/8021q/vlan.h
+++ b/net/8021q/vlan.h
@@ -38,9 +38,9 @@
 static inline unsigned int vlan_proto_idx(__be16 proto)
 {
 	switch (proto) {
-	case __constant_htons(ETH_P_8021Q):
+	case htons(ETH_P_8021Q):
 		return VLAN_PROTO_8021Q;
-	case __constant_htons(ETH_P_8021AD):
+	case htons(ETH_P_8021AD):
 		return VLAN_PROTO_8021AD;
 	default:
 		BUG();