net: make sk_ehashfn() static

sk_ehashfn() is only used from a single file.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_hashtables.h

@@ -359,7 +359,6 @@ static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
 			     refcounted);
 }
 
-u32 sk_ehashfn(const struct sock *sk);
 u32 inet6_ehashfn(const struct net *net,
 		  const struct in6_addr *laddr, const u16 lport,
 		  const struct in6_addr *faddr, const __be16 fport);

net/ipv4/inet_hashtables.c

@@ -43,7 +43,7 @@ static u32 inet_ehashfn(const struct net *net, const __be32 laddr,
 /* This function handles inet_sock, but also timewait and request sockets
  * for IPv4/IPv6.
  */
-u32 sk_ehashfn(const struct sock *sk)
+static u32 sk_ehashfn(const struct sock *sk)
 {
 #if IS_ENABLED(CONFIG_IPV6)
 	if (sk->sk_family == AF_INET6 &&