inet6: Remove inet6_destroy_sock().

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2160516
Tested: compile only

commit 1f8c4ee
Author: Kuniyuki Iwashima <kuniyu@amazon.com>
Date:   Wed Oct 19 15:36:02 2022 -0700

    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>

Signed-off-by: Xin Long <lxin@redhat.com>

Author: Xin Long

include/net/transp_v6.h

@@ -56,8 +56,6 @@ 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

@@ -492,7 +492,7 @@ 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;
@@ -517,12 +517,6 @@ 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);
 
 /*