ipv6: fix exthdrs offload registration in out_rt path

[ Upstream commit e41b0bedba0293b9e1e8d1e8ed553104b9693656 ]

We previously register IPPROTO_ROUTING offload under inet6_add_offload(),
but in error path, we try to unregister it with inet_del_offload(). This
doesn't seem correct, it should actually be inet6_del_offload(), also
ipv6_exthdrs_offload_exit() from that commit seems rather incorrect (it
also uses rthdr_offload twice), but it got removed entirely later on.

Fixes: 3336288a9f ("ipv6: Switch to using new offload infrastructure.")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

net/ipv6/exthdrs_offload.c

@@ -36,6 +36,6 @@ out:
 	return ret;
 
 out_rt:
-	inet_del_offload(&rthdr_offload, IPPROTO_ROUTING);
+	inet6_del_offload(&rthdr_offload, IPPROTO_ROUTING);
 	goto out;
 }