test/orc: soft fail if filename isn't given

Otherwise the test suite complains.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

test/orc.c

diff --git a/test/orc.c b/test/orc.c
index eda5b7a..1421342 100644
--- a/test/orc.c
+++ b/test/orc.c
@@ -79,7 +79,7 @@
 
 	if (argc < 2) {
 		fprintf(stderr, "%s: <file>\n", argv[0]);
-		return 1;
+		return 0;
 	}
 
 	ret = io_uring_queue_init(8, &ring, 0);