io_uring: correct O_NONBLOCK check for splice punt

The splice file punt check uses file->f_mode to check for O_NONBLOCK,
but it should be checking file->f_flags. This leads to punting even
for files that have O_NONBLOCK set, which isn't necessary. This equates
to checking for FMODE_PATH, which will never be set on the fd in
question.

Fixes: 7d67af2c ("io_uring: add splice(2) support")
Signed-off-by: Jens Axboe <axboe@kernel.dk>

fs/io_uring.c

@@ -2763,7 +2763,7 @@ static bool io_splice_punt(struct file *file)
 		return false;
 	if (!io_file_supports_async(file))
 		return true;
-	return !(file->f_mode & O_NONBLOCK);
+	return !(file->f_flags & O_NONBLOCK);
 }
 
 static int io_splice(struct io_kiocb *req, bool force_nonblock)