[PATCH] md: Missing mddev_put in md resync code

Whenever a ITERATE_MDDEV loop is exitted abnormally
we need to mddev_put the current mddev.  There was
one point in md_do_sync where we didn't so use counts
became wrong.

drivers/md/md.c

@@ -2920,8 +2920,10 @@ static void md_do_sync(void *data)
 					goto skip;
 				}
 			}
-			if (mddev->curr_resync == 1)
+			if (mddev->curr_resync == 1) {
+				mddev_put(mddev2);
 				break;
+			}
 		}
 	} while (mddev->curr_resync < 2);