inet6: Remove inet6_destroy_sock().

The last user of inet6_destroy_sock() is its wrapper inet6_cleanup_sock().
Let's rename inet6_destroy_sock() to inet6_cleanup_sock().
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/transp_v6.h

@@ -58,8 +58,6 @@ ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, __u16 srcp,
 
 #define LOOPBACK4_IPV6 cpu_to_be32(0x7f000006)
 
-void inet6_destroy_sock(struct sock *sk);
-
 #define IPV6_SEQ_DGRAM_HEADER					       \
 	"  sl  "						       \
 	"local_address                         "		       \

net/ipv6/af_inet6.c

@@ -490,7 +490,7 @@ int inet6_release(struct socket *sock)
 }
 EXPORT_SYMBOL(inet6_release);
 
-void inet6_destroy_sock(struct sock *sk)
+void inet6_cleanup_sock(struct sock *sk)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct sk_buff *skb;
@@ -515,12 +515,6 @@ void inet6_destroy_sock(struct sock *sk)
 		txopt_put(opt);
 	}
 }
-EXPORT_SYMBOL_GPL(inet6_destroy_sock);
-
-void inet6_cleanup_sock(struct sock *sk)
-{
-	inet6_destroy_sock(sk);
-}
 EXPORT_SYMBOL_GPL(inet6_cleanup_sock);
 
 /*