dm: remove useless loop in __split_and_process_bio

Remove useless "while" loop. If the condition ci.sector_count && !error is
true, we go to a branch that ends with "break". If this condition is
false, the "while" loop will not be executed again. So, the loop can't be
executed more than once.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm.c

@@ -1641,7 +1641,6 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md,
 	} else {
 		ci.bio = bio;
 		ci.sector_count = bio_sectors(bio);
-		while (ci.sector_count && !error) {
 		error = __split_and_process_non_flush(&ci);
 		if (ci.sector_count && !error) {
 			/*
@@ -1671,8 +1670,6 @@ static blk_qc_t __split_and_process_bio(struct mapped_device *md,
 			bio_chain(b, bio);
 			trace_block_split(b, bio->bi_iter.bi_sector);
 			ret = submit_bio_noacct(bio);
-				break;
-			}
 		}
 	}