Close spare sock at exit.

src/mosquitto.c

@@ -432,7 +432,7 @@ int main(int argc, char *argv[])
 	}
 
 	config__cleanup(int_db.config);
-	net__cleanup();
+	net__broker_cleanup();
 
 	return rc;
 }

src/mosquitto_broker_internal.h

@@ -515,6 +515,7 @@ int send__suback(struct mosquitto *context, uint16_t mid, uint32_t payloadlen, c
  * Network functions
  * ============================================================ */
 void net__broker_init(void);
+void net__broker_cleanup(void);
 int net__socket_accept(struct mosquitto_db *db, mosq_sock_t listensock);
 int net__socket_listen(struct mosquitto__listener *listener);
 int net__socket_get_address(mosq_sock_t sock, char *buf, int len);

src/net.c

@@ -69,6 +69,16 @@ void net__broker_init(void)
 }
 
 
+void net__broker_cleanup(void)
+{
+	if(spare_sock != INVALID_SOCKET){
+		COMPAT_CLOSE(spare_sock);
+		spare_sock = INVALID_SOCKET;
+	}
+	net__cleanup();
+}
+
+
 static void net__print_error(int log, const char *format_str)
 {
 #ifdef WIN32