Function SilcGetChannelCallback
SYNOPSIS
typedef void (*SilcGetClientCallback)(SilcClient client,
SilcClientConnection conn,
SilcClientEntry *clients,
uint32 clients_count,
void *context);
DESCRIPTION
Callback function given to the silc_client_get_channel_* functions.
The found entries are allocated into the `channels' array. The array
must not be freed by the receiver, the library will free it later.
If the `channel' is NULL, no such channel exist in the SILC Network.