dm integrity: convert to use le64_add_cpu()

Convert cpu_to_le64(le64_to_cpu(E1) + E2) to use le64_add_cpu().

Signed-off-by: Liu Shixin <liushixin2@huawei.com>

drivers/md/dm-integrity.c

@@ -3696,7 +3696,7 @@ static int create_journal(struct dm_integrity_c *ic, char **error)
 retest_commit_id:
 		for (j = 0; j < i; j++) {
 			if (ic->commit_ids[j] == ic->commit_ids[i]) {
-				ic->commit_ids[i] = cpu_to_le64(le64_to_cpu(ic->commit_ids[i]) + 1);
+				le64_add_cpu(&ic->commit_ids[i], 1);
 				goto retest_commit_id;
 			}
 		}