[NETFILTER]: x_tables: switch xt_match->checkentry 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_mark.c b/net/netfilter/xt_mark.c
index 10c6799..83ed8067 100644
--- a/net/netfilter/xt_mark.c
+++ b/net/netfilter/xt_mark.c
@@ -34,7 +34,7 @@
 	return ((skb->mark & info->mask) == info->mark) ^ info->invert;
 }
 
-static int
+static bool
 checkentry(const char *tablename,
 	   const void *entry,
 	   const struct xt_match *match,
@@ -45,9 +45,9 @@
 
 	if (minfo->mark > 0xffffffff || minfo->mask > 0xffffffff) {
 		printk(KERN_WARNING "mark: only supports 32bit mark\n");
-		return 0;
+		return false;
 	}
-	return 1;
+	return true;
 }
 
 #ifdef CONFIG_COMPAT