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destroy_shader_state()/destroy_program_state() are called when the qdata
pointer to the state cache structure gets overwritten, but were only
conditionally destroying it. This lead to leaks when called with a
shader/program state ref count > 1.
Fixes: 9b9e12edb
("cogl: Port Node/Pipeline/PipelineLayer away from CoglObject")
Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/3141
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3366>