[NETFILTER]: x_tables: switch xt_match->match to bool

Switch the return type of match functions to boolean

Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netfilter/xt_connmark.c b/net/netfilter/xt_connmark.c
index 8a6d58a..3321b80 100644
--- a/net/netfilter/xt_connmark.c
+++ b/net/netfilter/xt_connmark.c
@@ -30,7 +30,7 @@
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("ipt_connmark");
 
-static int
+static bool
 match(const struct sk_buff *skb,
       const struct net_device *in,
       const struct net_device *out,
@@ -46,7 +46,7 @@
 
 	ct = nf_ct_get(skb, &ctinfo);
 	if (!ct)
-		return 0;
+		return false;
 
 	return (((ct->mark) & info->mask) == info->mark) ^ info->invert;
 }