turbostat: Clean up error handling; disambiguate error messages; use err and errx
Most of turbostat's error handling consists of printing an error (often including an errno) and exiting. Since perror doesn't support a format string, those error messages are often ambiguous, such as just showing a file path, which doesn't uniquely identify which call failed. turbostat already uses _GNU_SOURCE, so switch to the err and errx functions from err.h, which take a format string. Signed-off-by: NJosh Triplett <josh@joshtriplett.org> Signed-off-by: NLen Brown <len.brown@intel.com>
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