md: simplify the code with md_kick_rdev_from_array

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 25d4542..459f189 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2478,8 +2478,7 @@
 		if (add_journal)
 			mddev_resume(mddev);
 		if (err) {
-			unbind_rdev_from_array(rdev);
-			export_rdev(rdev);
+			md_kick_rdev_from_array(rdev);
 			return err;
 		}
 	}