dbus_g_method_return_error is not modifying or freeing the GError it receives, so its error parameter should have the "const" modifier added.
Created attachment 23286 [details] [review] 0001-Bug-19927-Use-const-for-GError-param-we-re-not-m.patch
Colin: not that I'm really a reviewer for dbus-glib, but I approve of this patch. (Any chance you could look at some of mine? :-)
Thanks for the review, pushed.
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