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On GLES2 reading and writing some Cogl formats is not supported natively. In those cases we use another format to do the reading and writing. When the internal format and the temporary format differ in premultiplication, Cogl tries to adjust for it. Opaque Cogl formats don't have the premult bit set but our internal format is a premult format. Cogl tries to adjust for it but completely misses that the opaque format doesn't have an alpha channel and it should not do so at all. So skip the premult adjusting when the Cogl format has no alpha channel. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3065>