io_uring: don't restrict issue_flags for io_openat

45d189c606292 ("io_uring: replace force_nonblock with flags") did
something strange for io_openat() slicing all issue_flags but
IO_URING_F_NONBLOCK. Not a bug for now, but better to just forward the
flags.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fs/io_uring.c b/fs/io_uring.c
index d30cbf0..92c25b5 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3828,7 +3828,7 @@
 
 static int io_openat(struct io_kiocb *req, unsigned int issue_flags)
 {
-	return io_openat2(req, issue_flags & IO_URING_F_NONBLOCK);
+	return io_openat2(req, issue_flags);
 }
 
 static int io_remove_buffers_prep(struct io_kiocb *req,