Florian Müllner aa1eaa8120 output-xrandr: Consistently return -1 on error
Returning FALSE does not indicate an error, but a valid backlight
value of 0. Consumers expect a negative value to indicate no
backlight support, so return -1 in case of error, just like we
already do for invalid values.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2947>
2023-04-04 19:30:05 +00:00
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