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libbacklight: Fix backlight never gets initialized

Sören Meier requested to merge soerenmeier/weston:libbacklight into main

In 913d7c15 stricter error checking was introduced to the strtol call, which broke reading backlight values. Since every sysfs backlight file ends with a newline.

As noted in a comment in the previous MR to prevent damaged pointers after calling asprintf, replace every asprintf call with str_printf.

Previous-MR: !543 (closed)

Signed-off-by: Sören Meier soerenmeier@livgood.ch

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