2018-02-04  Rico Tzschichholz  <ricotz@ubuntu.com>

	Release 0.38.7

	codegen: Don't try to infer error argument on async begin methods
	Only the async finish method might have an error parameter.

	Regression of 527dac8050fe90d7a28619383f11e968ab5c9a77

	https://bugzilla.gnome.org/show_bug.cgi?id=793158