t/io_uring: improve EOPNOTSUPP message

Put in one line and include kernel as well.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/t/io_uring.c b/t/io_uring.c
index 208b58a..62dee80 100644
--- a/t/io_uring.c
+++ b/t/io_uring.c
@@ -264,8 +264,7 @@
 			if (cqe->res != BS) {
 				printf("io: unexpected ret=%d\n", cqe->res);
 				if (polled && cqe->res == -EOPNOTSUPP)
-					printf("Your filesystem/device doesn't "
-						"support polled IO\n");
+					printf("Your filesystem/driver/kernel doesn't support polled IO\n");
 				return -1;
 			}
 		}