Changed "0 to NULL" to avoid Sparse warning

fs/direct-io.c:1137:36: warning: Using plain integer as NULL

Signed-off-by: Jules Irenge <jbi.octave@gmail.com>
---
 fs/direct-io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/direct-io.c b/fs/direct-io.c
index f669163d5860..87910761039e 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -1134,7 +1134,7 @@ ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
 	loff_t offset = iocb->ki_pos;
 	const loff_t end = offset + count;
 	struct dio *dio;
-	struct dio_submit sdio = { 0, };
+	struct dio_submit sdio = { NULL, };
 	struct buffer_head map_bh = { 0, };
 	struct blk_plug plug;
 	unsigned long align = offset | iov_iter_alignment(iter);
-- 
2.35.1