Turbostat: make DO_OR_GOTO_ERR look like a function

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
[git@lerya.net: Ported from other git, changed commit name]
Signed-off-by: Vincent Brillault <git@lerya.net>
Turbostat: Rename instance type "pc%02d" to "pkg%02d"