netfilter: nft_rt: make local functions static

Resolves warnings:
net/netfilter/nft_rt.c:26:6: warning: no previous prototype for ‘nft_rt_get_eval’ [-Wmissing-prototypes]
net/netfilter/nft_rt.c:75:5: warning: no previous prototype for ‘nft_rt_get_init’ [-Wmissing-prototypes]
net/netfilter/nft_rt.c:106:5: warning: no previous prototype for ‘nft_rt_get_dump’ [-Wmissing-prototypes]
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nft_rt.c

@@ -23,7 +23,7 @@ struct nft_rt {
 	enum nft_registers	dreg:8;
 };
 
-void nft_rt_get_eval(const struct nft_expr *expr,
+static void nft_rt_get_eval(const struct nft_expr *expr,
 			    struct nft_regs *regs,
 			    const struct nft_pktinfo *pkt)
 {
@@ -72,7 +72,7 @@ const struct nla_policy nft_rt_policy[NFTA_RT_MAX + 1] = {
 	[NFTA_RT_KEY]		= { .type = NLA_U32 },
 };
 
-int nft_rt_get_init(const struct nft_ctx *ctx,
+static int nft_rt_get_init(const struct nft_ctx *ctx,
 			   const struct nft_expr *expr,
 			   const struct nlattr * const tb[])
 {
@@ -103,7 +103,7 @@ int nft_rt_get_init(const struct nft_ctx *ctx,
 					   NFT_DATA_VALUE, len);
 }
 
-int nft_rt_get_dump(struct sk_buff *skb,
+static int nft_rt_get_dump(struct sk_buff *skb,
 			   const struct nft_expr *expr)
 {
 	const struct nft_rt *priv = nft_expr_priv(expr);