tcp md5sig: Remove redundant protocol argument.

Protocol is always TCP, so remove useless protocol argument.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index ad993ec..f3ffd67 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -607,7 +607,6 @@
 					       md5,
 					       sk, NULL, NULL,
 					       tcp_hdr(skb),
-					       sk->sk_protocol,
 					       skb->len);
 	}
 #endif
@@ -2266,7 +2265,7 @@
 		tp->af_specific->calc_md5_hash(md5_hash_location,
 					       md5,
 					       NULL, dst, req,
-					       tcp_hdr(skb), sk->sk_protocol,
+					       tcp_hdr(skb),
 					       skb->len);
 	}
 #endif