pttc: check for sscanf() errors
pttc: check for sscanf() errors

When parsing c-states, we check for zero, one, and two matches.  Add a
default case to handle sscanf() errors and bogous return values.

Change-Id: I707e6f467dee1da33a1658aa06085660bb3d0a15
Signed-off-by: Markus Metzger <5f675b2b36595f90898e014b548ff7d9bbff2ab7@intel.com>

01org/processor-trace,01org/processor-trace,01org/processor-trace