quota: unify quota init condition in setattr

Quota must being initialized if size or uid/git changes requested.
But initialization performed in two different places:
in case of i_size file system is responsible for dquot init
, but in case of uid/gid init will be called internally in
dquot_transfer().
This ambiguity makes code harder to understand.
Let's move this logic to one common helper function.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index b1a5036..1056a21 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1822,10 +1822,9 @@
 		mask |= 1 << GRPQUOTA;
 		chid[GRPQUOTA] = iattr->ia_gid;
 	}
-	if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode)) {
-		dquot_initialize(inode);
+	if (sb_any_quota_active(inode->i_sb) && !IS_NOQUOTA(inode))
 		return __dquot_transfer(inode, chid, mask);
-	}
+
 	return 0;
 }
 EXPORT_SYMBOL(dquot_transfer);