[NETFILTER]: ipt_recent: fix sparse warnings

net/ipv4/netfilter/ipt_recent.c:215:17: warning: symbol 't' shadows an earlier one
net/ipv4/netfilter/ipt_recent.c:179:22: originally declared here
net/ipv4/netfilter/ipt_recent.c:322:13: warning: context imbalance in 'recent_seq_start' - wrong count at exit
net/ipv4/netfilter/ipt_recent.c:354:13: warning: context imbalance in 'recent_seq_stop' - unexpected unlock

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/netfilter/ipt_recent.c

@@ -212,11 +212,11 @@ recent_mt(const struct sk_buff *skb, const struct net_device *in,
 		recent_entry_remove(t, e);
 		ret = !ret;
 	} else if (info->check_set & (IPT_RECENT_CHECK | IPT_RECENT_UPDATE)) {
-		unsigned long t = jiffies - info->seconds * HZ;
+		unsigned long time = jiffies - info->seconds * HZ;
 		unsigned int i, hits = 0;
 
 		for (i = 0; i < e->nstamps; i++) {
-			if (info->seconds && time_after(t, e->stamps[i]))
+			if (info->seconds && time_after(time, e->stamps[i]))
 				continue;
 			if (++hits >= info->hit_count) {
 				ret = !ret;
@@ -320,6 +320,7 @@ struct recent_iter_state {
 };
 
 static void *recent_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(recent_lock)
 {
 	struct recent_iter_state *st = seq->private;
 	const struct recent_table *t = st->table;
@@ -352,6 +353,7 @@ static void *recent_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 }
 
 static void recent_seq_stop(struct seq_file *s, void *v)
+	__releases(recent_lock)
 {
 	spin_unlock_bh(&recent_lock);
 }