Fix incorrect call to setsockopt() for TCP_NODELAY.

Closes #941. Thanks to rfalke.

Signed-off-by: Roger A. Light <roger@atchoo.org>

ChangeLog.txt

@@ -3,6 +3,7 @@
 
 Broker:
 - Fix build when using WITH_ADNS=yes.
+- Fix incorrect call to setsockopt() for TCP_NODELAY. Closes #941.
 
 
 1.5.1 - 20180816

src/net.c

@@ -121,7 +121,7 @@ int net__socket_accept(struct mosquitto_db *db, mosq_sock_t listensock)
 
 	if(db->config->set_tcp_nodelay){
 		int flag = 1;
-		if(setsockopt(new_sock, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(int) != 0)){
+		if(setsockopt(new_sock, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(int)) != 0){
 			log__printf(NULL, MOSQ_LOG_WARNING, "Warning: Unable to set TCP_NODELAY.");
 		}
 	}