Marco Trevisan (Treviño) 4b0a10c562 backends/kms/update: Add ability to remove result listeners
We may need to remove a result listener once we've added it, and before
that it ha been processed, so add support for this.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1952>
2022-01-25 07:31:19 +00:00
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