[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: NMatthias M. Dellweg <2500@gmx.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/tcp_ipv4.c

@@ -858,16 +858,16 @@ int tcp_v4_md5_do_add(struct sock *sk, __be32 addr,
 		      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;
 

net/ipv6/tcp_ipv6.c

@@ -561,16 +561,16 @@ static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
 			     char *newkey, u8 newkeylen)
 {
 	/* Add key to the list */
-	struct tcp6_md5sig_key *key;
+	struct tcp_md5sig_key *key;
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct tcp6_md5sig_key *keys;
 
-	key = (struct tcp6_md5sig_key*) tcp_v6_md5_do_lookup(sk, peer);
+	key = tcp_v6_md5_do_lookup(sk, peer);
 	if (key) {
 		/* modify 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 {
 		/* reallocate new list if current one is full. */
 		if (!tp->md5sig_info) {