[NETFILTER]: Remove redundant parentheses/braces

Removes redundant parentheses and braces (And add one pair in a
xt_tcpudp.c macro).

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_length.c b/net/netfilter/xt_length.c
index 57bcfac..ea4880b 100644
--- a/net/netfilter/xt_length.c
+++ b/net/netfilter/xt_length.c
@@ -47,8 +47,8 @@
        bool *hotdrop)
 {
 	const struct xt_length_info *info = matchinfo;
-	const u_int16_t pktlen = (ntohs(ipv6_hdr(skb)->payload_len) +
-				  sizeof(struct ipv6hdr));
+	const u_int16_t pktlen = ntohs(ipv6_hdr(skb)->payload_len) +
+				 sizeof(struct ipv6hdr);
 
 	return (pktlen >= info->min && pktlen <= info->max) ^ info->invert;
 }