Block: blk-flush: Fixed indent code style

Fixed code indent should use tabs where possible.

Signed-off-by: Alice Ferrazzi <alice.ferrazzi@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-flush.c b/block/blk-flush.c
index db8f1b5..cc2b827 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -444,7 +444,7 @@
 	 * copied from blk_rq_pos(rq).
 	 */
 	if (error_sector)
-               *error_sector = bio->bi_sector;
+		*error_sector = bio->bi_sector;
 
 	if (!bio_flagged(bio, BIO_UPTODATE))
 		ret = -EIO;