[PATCH] powertop fix buffer overflow, removed unecessary strlen call

[haroon maqsood]

Hi,
PFA a small change to procps/powertop that removes a potential buffer overflow
reported by gcc.
in my opinion as dirent->d_name is allocated on the stack , we can avoid the
strlen call, and make the char buf[] a bit bigger to accomodate the strings
that are hardcoded i.e /proc/acpi/process/d->d_name/power.
Thanks
Haroon
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