We won't get no error if we are not testing fd -1 sockets any more, and use errno for consistent parsing of socket close errors

src/connector.c

@@ -521,11 +521,11 @@ void *receiver(void *arg)
 			/* See what type of error this is and raise the log
 			 * level of the message if it's unexpected. */
 			getsockopt(client->fd, SOL_SOCKET, SO_ERROR, (void *)&error, &errlen);
-			if (error && error != 104) {
+			if (error != 104) {
-				LOGNOTICE("Client id %"PRId64" fd %d epollerr HUP in epoll with error %d: %s",
+				LOGNOTICE("Client id %"PRId64" fd %d epollerr HUP in epoll with errno %d: %s",
 					  client->id, client->fd, error, strerror(error));
 			} else {
-				LOGINFO("Client id %"PRId64" fd %d epollerr HUP in epoll with error %d: %s",
+				LOGINFO("Client id %"PRId64" fd %d epollerr HUP in epoll with errno %d: %s",
 					client->id, client->fd, error, strerror(error));
 			}
 			invalidate_client(cdata->pi->ckp, cdata, client);