backend-drm: fix issues in libbacklight
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
The value of brightness node in backlight sys file may
end with '\n', which is not accepted by safe_strtoint.
Another issue is that buffer pointer is damaged by the
read call, so it will be dangerous to free it if the
following asprintf fails.