Due the aggresive security checks in compiler 'printf' might be substituded with
'__printf_chk'. However it does not differentiate whether substituted string is
library function call whether field in structure.
By renaming field we prevent it to be unintentionally subustituted by the
preprocessor.
Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
