net/smc: unlock on error paths in __smc_setsockopt()

These two error paths need to release_sock(sk) before returning.

Fixes: a6a6fe27 ("net/smc: Dynamic control handshake limitation by socket options")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: D. Wythe <alibuda@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/smc/af_smc.c

@@ -2715,10 +2715,14 @@ static int __smc_setsockopt(struct socket *sock, int level, int optname,
 	lock_sock(sk);
 	switch (optname) {
 	case SMC_LIMIT_HS:
-		if (optlen < sizeof(int))
-			return -EINVAL;
-		if (copy_from_sockptr(&val, optval, sizeof(int)))
-			return -EFAULT;
+		if (optlen < sizeof(int)) {
+			rc = -EINVAL;
+			break;
+		}
+		if (copy_from_sockptr(&val, optval, sizeof(int))) {
+			rc = -EFAULT;
+			break;
+		}
 
 		smc->limit_smc_hs = !!val;
 		rc = 0;