xfrm: Introduce LINUX_MIB_XFRMFWDHDRERROR

XFRMINHDRERROR counter is ambigous when validating forwarding
path. It makes it tricky to debug when you have both in and fwd
validation.

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/snmp.h b/include/linux/snmp.h
index 0f953fe..e28f5a0 100644
--- a/include/linux/snmp.h
+++ b/include/linux/snmp.h
@@ -257,6 +257,7 @@
 	LINUX_MIB_XFRMOUTPOLBLOCK,		/* XfrmOutPolBlock */
 	LINUX_MIB_XFRMOUTPOLDEAD,		/* XfrmOutPolDead */
 	LINUX_MIB_XFRMOUTPOLERROR,		/* XfrmOutPolError */
+	LINUX_MIB_XFRMFWDHDRERROR,		/* XfrmFwdHdrError*/
 	__LINUX_MIB_XFRMMAX
 };