ksmbd: extend the connection limiting mechanism to support IPv6

commit c0d41112 upstream.

Update the connection tracking logic to handle both IPv4 and IPv6
address families.

Cc: stable@vger.kernel.org
Fixes: e6bb9193 ("ksmbd: limit repeated connections from clients with the same IP")
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>