[NETFILTER]: nf_conntrack_h323: remove unnecessary process of Information signal

According to the implementation of H.323, it's not necessary to check
the addresses in Information signals.

Signed-off-by: Jing Min Zhao <zhaojingmin@vivecode.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>