pttc: use strnlen() to determine the length of fileroot in yasm_alloc()
pttc: use strnlen() to determine the length of fileroot in yasm_alloc()

Change-Id: I30162dad1ad34879f915eba89443aba7e5e1cffb
Signed-off-by: Markus Metzger <5f675b2b36595f90898e014b548ff7d9bbff2ab7@intel.com>

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