TpBaseConnection: Remove calls to G_TYPE_INSTANCE_GET_PRIVATE where they add no value
TpBaseConnection: Remove calls to G_TYPE_INSTANCE_GET_PRIVATE where they add no value

tp_base_connection_close_all_channels is internal, so the type can be
assumed to have been checked already. In the constructor and the two
D-Bus methods we've just checked the type anyway.

Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib