Fix propagation of error value on failure to connect to fio server

Fio does detect the error and exits, but it doesn't exit with
a non-zero exit value.

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/init.c b/init.c
index c3996a7..e944856 100644
--- a/init.c
+++ b/init.c
@@ -1963,11 +1963,8 @@
 	if (do_exit && !(is_backend || nr_clients))
 		exit(exit_val);
 
-	if (nr_clients && fio_clients_connect()) {
-		do_exit++;
-		exit_val = 1;
-		return -1;
-	}
+	if (nr_clients && fio_clients_connect())
+		exit(1);
 
 	if (is_backend && backend)
 		return fio_start_server(pid_file);