[TCP] MD5: Remove some more unnecessary casting.

while reviewing the tcp_md5-related code further i came across with
another two of these casts which you probably have missed. I don't
actually think that they impose a problem by now, but as you said we
should remove them.

Signed-off-by: Matthias M. Dellweg <2500@gmx.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/tcp_ipv4.c

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index ad759f1..d3d8d5d 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -858,16 +858,16 @@
 		      u8 *newkey, u8 newkeylen)
 {
 	/* Add Key to the list */
-	struct tcp4_md5sig_key *key;
+	struct tcp_md5sig_key *key;
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp4_md5sig_key *keys;
 
-	key = (struct tcp4_md5sig_key *)tcp_v4_md5_do_lookup(sk, addr);
+	key = tcp_v4_md5_do_lookup(sk, addr);
 	if (key) {
 		/* Pre-existing entry - just update that one. */
-		kfree(key->base.key);
-		key->base.key = newkey;
-		key->base.keylen = newkeylen;
+		kfree(key->key);
+		key->key = newkey;
+		key->keylen = newkeylen;
 	} else {
 		struct tcp_md5sig_info *md5sig;