exit if conv. from string to double fails
atof(3), whose return value is undefined on error, is used to parse
command line arguments, leading to undefined behavior if something else
than a number is specified.
this patch uses strtod(3) and exits on error.
Properly round the new brightness value
Previously, it was always rounded down, which meant that -dec X would
result in a bigger change than -inc X for the same X if rounding took place.
Updates may require up to 24 hours to propagate to mirrors. If the following command doesn't work, please retry later:
sudo dnf upgrade --refresh --advisory=FEDORA-2020-cb53887cbd
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