Given these files are part of procfs, let's use the correct API calls for reading them. This changes one occasion of read_one_line_file() to read_full_virtual_file(), which superficially is a different thing, but shouldn't actually be a difference, since sysctls can't be longer than 4K anyway, and the piecemeal logic behind read_one_line_file() cannot work with the special semantics of procfs anyway.
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