* dbus/dbus-string.h (_dbus_string_get_byte): inline when asserts
	are disabled
	(_dbus_string_get_const_data): inline when asserts are disabled

	* dbus/dbus-message.c: record the _dbus_current_generation of
	creation so we can complain if dbus_shutdown() is used improperly.
	Do this only if checks are enabled.

	* dbus/dbus-connection.c: ditto