tcp: Remove runtime check that can never be true.

GCC even warns about it, as reported by Andrew Morton:

net/ipv4/tcp.c: In function 'do_tcp_getsockopt':
net/ipv4/tcp.c:2544: warning: comparison is always false due to limited range of data type
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/tcp.c

@@ -2540,11 +2540,6 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
 			ctd.tcpct_cookie_desired = cvp->cookie_desired;
 			ctd.tcpct_s_data_desired = cvp->s_data_desired;
 
-			/* Cookie(s) saved, return as nonce */
-			if (sizeof(ctd.tcpct_value) < cvp->cookie_pair_size) {
-				/* impossible? */
-				return -EINVAL;
-			}
 			memcpy(&ctd.tcpct_value[0], &cvp->cookie_pair[0],
 			       cvp->cookie_pair_size);
 			ctd.tcpct_used = cvp->cookie_pair_size;