xt_quota: report initial quota value instead of current value to userspace

We should copy the initial value to userspace for iptables-save and
to allow removal of specific quota rules.

Signed-off-by: Changli Gao <[e-mail]>
Signed-off-by: Patrick McHardy <[e-mail]>

include/linux/netfilter/xt_quota.h

···
 struct xt_quota_info {
 	u_int32_t		flags;
 	u_int32_t		pad;
+	aligned_u64		quota;
 
 	/* Used internally by the kernel */
-	aligned_u64		quota;
 	struct xt_quota_priv	*master;
 };
 

net/netfilter/xt_quota.c

···
 		/* we do not allow even small packets from now on */
 		priv->quota = 0;
 	}
-	/* Copy quota back to matchinfo so that iptables can display it */
-	q->quota = priv->quota;
 	spin_unlock_bh(&priv->lock);
 
 	return ret;