soreuseport: fix use of uid in tb->fastuid

Fix a reported compilation error where ia variable of type kuid_t
was being set to zero.

Eliminate two instances of setting tb->fastuid to zero.  tb->fastuid is
only used if tb->fastreuseport is set, so there should be no problem if
tb->fastuid is not initialized (when tb->fastreuesport is zero).
Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/inet_connection_sock.c

@@ -204,7 +204,8 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
 			ret = 1;
 			if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, true)) {
 				if (((sk->sk_reuse && sk->sk_state != TCP_LISTEN) ||
-				     (sk->sk_reuseport && uid_eq(tb->fastuid, uid))) &&
+				     (tb->fastreuseport > 0 &&
+				      sk->sk_reuseport && uid_eq(tb->fastuid, uid))) &&
 				    smallest_size != -1 && --attempts >= 0) {
 					spin_unlock(&head->lock);
 					goto again;
@@ -227,19 +228,15 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
 		if (sk->sk_reuseport) {
 			tb->fastreuseport = 1;
 			tb->fastuid = uid;
-		} else {
+		} else
 			tb->fastreuseport = 0;
-			tb->fastuid = 0;
-		}
 	} else {
 		if (tb->fastreuse &&
 		    (!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
 			tb->fastreuse = 0;
 		if (tb->fastreuseport &&
-		    (!sk->sk_reuseport || !uid_eq(tb->fastuid, uid))) {
+		    (!sk->sk_reuseport || !uid_eq(tb->fastuid, uid)))
 			tb->fastreuseport = 0;
-			tb->fastuid = 0;
-		}
 	}
 success:
 	if (!inet_csk(sk)->icsk_bind_hash)