UBIFS: remove a bit of unneeded code

This is a clean-up patch which:

1. Removes explicite 'hrtimer_cancel()' after 'ubifs_wbuf_sync()' in
   'ubifs_remount_ro()', because the timers will be canceled by
   'ubifs_wbuf_sync()', no need to cancel them for the second time.
2. Remove "if (c->jheads)" check from 'ubifs_put_super()', because
   at journal heads must always be allocated there, since we checked
   earlier that we were mounted R/W, and the olny situation when
   journal heads are not allocated is when mounter or re-mounted R/O.
Signed-off-by: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>

fs/ubifs/super.c

@@ -1686,10 +1686,8 @@ static void ubifs_remount_ro(struct ubifs_info *c)
 
 	dbg_save_space_info(c);
 
-	for (i = 0; i < c->jhead_cnt; i++) {
+	for (i = 0; i < c->jhead_cnt; i++)
 		ubifs_wbuf_sync(&c->jheads[i].wbuf);
-		hrtimer_cancel(&c->jheads[i].wbuf.timer);
-	}
 
 	c->mst_node->flags &= ~cpu_to_le32(UBIFS_MST_DIRTY);
 	c->mst_node->flags |= cpu_to_le32(UBIFS_MST_NO_ORPHS);
@@ -1754,9 +1752,8 @@ static void ubifs_put_super(struct super_block *sb)
 			int err;
 
 			/* Synchronize write-buffers */
-			if (c->jheads)
-				for (i = 0; i < c->jhead_cnt; i++)
-					ubifs_wbuf_sync(&c->jheads[i].wbuf);
+			for (i = 0; i < c->jhead_cnt; i++)
+				ubifs_wbuf_sync(&c->jheads[i].wbuf);
 
 			/*
 			 * We are being cleanly unmounted which means the