Niels De Graef 769a02b630 cogl: Drop _COGL_RETURN_VAL_IF_FAIL macro
This was introduced when the Cogl maintainers tried to move away from
GLib. Since we always require it, we can just use
`g_return_val_if_fail()` immediately.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/629
2019-06-19 21:46:22 +02:00
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