ubifs: Fix wrong dirty space budget for dirty inode

Each dirty inode should reserve 'c->bi.inode_budget' bytes in space
budget calculation. Currently, space budget for dirty inode reports
more space than what UBIFS actually needs to write.

Fixes: 1e51764a ("UBIFS: add new flash file system")
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/ubifs/budget.c

@@ -400,7 +400,7 @@ static int calc_dd_growth(const struct ubifs_info *c,
 	dd_growth = req->dirtied_page ? c->bi.page_budget : 0;
 
 	if (req->dirtied_ino)
-		dd_growth += c->bi.inode_budget << (req->dirtied_ino - 1);
+		dd_growth += c->bi.inode_budget * req->dirtied_ino;
 	if (req->mod_dent)
 		dd_growth += c->bi.dent_budget;
 	dd_growth += req->dirtied_ino_d;