remove zero-size array in io_uring.h

This fixes compilation with -Werror=pedantic.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/src/include/liburing/io_uring.h b/src/include/liburing/io_uring.h
index e52ad2d..8555de9 100644
--- a/src/include/liburing/io_uring.h
+++ b/src/include/liburing/io_uring.h
@@ -308,7 +308,7 @@
 	__u8 ops_len;	/* length of ops[] array below */
 	__u16 resv;
 	__u32 resv2[3];
-	struct io_uring_probe_op ops[0];
+	struct io_uring_probe_op ops[];
 };
 
 struct io_uring_restriction {