pcp-atop: fix bounds checking on disk names (valgrind)
pcp-atop: fix bounds checking on disk names (valgrind)

Resolves a common failure mode observed in qa/1080 where
the atop allocated-memory bounds check was incorrect for
disk and logical volume names.

adfernandes/pcp,tjanez/pcp,aeg-aeg/pcpfans,adfernandes/pcp,adfernandes/pcp,prasincs/pcp,edwardt/pcp,wuliming/pcp,prasincs/pcp,aeg-aeg/pcpfans,prasincs/pcp,prasincs/pcp,adfernandes/pcp,prasincs/pcp,aeg-aeg/pcpfans,wuliming/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,tjanez/pcp,edwardt/pcp,wuliming/pcp,adfernandes/pcp,wuliming/pcp,adfernandes/pcp,edwardt/pcp,adfernandes/pcp,edwardt/pcp,prasincs/pcp,aeg-aeg/pcpfans,tjanez/pcp,aeg-aeg/pcpfans,edwardt/pcp,tjanez/pcp,edwardt/pcp,aeg-aeg/pcpfans,tjanez/pcp,edwardt/pcp,wuliming/pcp,edwardt/pcp,wuliming/pcp,prasincs/pcp,prasincs/pcp,tjanez/pcp,tjanez/pcp,aeg-aeg/pcpfans,aeg-aeg/pcpfans,tjanez/pcp