netfilter: remove unneeded switch fall-through

Empty case is fine and does not switch fall-through
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_nat_core.c

@@ -240,7 +240,7 @@ static bool l4proto_in_range(const struct nf_conntrack_tuple *tuple,
 	__be16 port;
 
 	switch (tuple->dst.protonum) {
-	case IPPROTO_ICMP: /* fallthrough */
+	case IPPROTO_ICMP:
 	case IPPROTO_ICMPV6:
 		return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) &&
 		       ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id);

net/netfilter/nf_tables_core.c

@@ -221,7 +221,6 @@ nft_do_chain(struct nft_pktinfo *pkt, void *priv)
 		chain = regs.verdict.chain;
 		goto do_chain;
 	case NFT_CONTINUE:
-		/* fall through */
 	case NFT_RETURN:
 		nft_trace_packet(&info, chain, rule,
 				 NFT_TRACETYPE_RETURN);