Make code better readable by replacing `if (rsp->ccode > 0)`
and 'if (rsp->ccode != 0)' with just `if (rsp->ccode)` as
rsp->ccode is anyway an unsigned byte and can't be negative.
Also replace 'if (rsp->ccode == 0)' with 'if (!rsp->ccode)'.
All these changes make lines shorter and easier to read as
a non-zero ccode is an indication of some failure, and so !ccode
naturally reads as 'no error'.
Signed-off-by: Alexander Amelkin <alexander@amelkin.msk.ru>
Commit re-works user interface of PEF module as well as internal functions.
Not all of the functionality is implemented as the main aim was interface
layout.
It's possible this commit introduces some breaking changes.
Changes are based on patch submitted by Jordan Hargrave, Dell Inc.
