[NETFILTER]: Parenthesize macro parameters

Parenthesize macro parameters.

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 271f6a5..f5b66ec 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -85,7 +85,7 @@
 	size_t i;
 	unsigned long ret;
 
-#define FWINV(bool,invflg) ((bool) ^ !!(ipinfo->invflags & invflg))
+#define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg)))
 
 	if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr,
 		  IPT_INV_SRCIP)
@@ -216,6 +216,7 @@
 			return 0;
 
 	return 1;
+#undef FWINV
 }
 
 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \