[NETFILTER]: x_tables: switch xt_target->checkentry to bool

Switch the return type of target checkentry 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/ipv4/netfilter/arpt_mangle.c b/net/ipv4/netfilter/arpt_mangle.c
index 6298d40..497a16e 100644
--- a/net/ipv4/netfilter/arpt_mangle.c
+++ b/net/ipv4/netfilter/arpt_mangle.c
@@ -65,7 +65,7 @@
 	return mangle->target;
 }
 
-static int
+static bool
 checkentry(const char *tablename, const void *e, const struct xt_target *target,
 	   void *targinfo, unsigned int hook_mask)
 {
@@ -73,12 +73,12 @@
 
 	if (mangle->flags & ~ARPT_MANGLE_MASK ||
 	    !(mangle->flags & ARPT_MANGLE_MASK))
-		return 0;
+		return false;
 
 	if (mangle->target != NF_DROP && mangle->target != NF_ACCEPT &&
 	   mangle->target != ARPT_CONTINUE)
-		return 0;
-	return 1;
+		return false;
+	return true;
 }
 
 static struct arpt_target arpt_mangle_reg = {