chassishandler.cpp: typofix valid/invalid
chassishandler.cpp: typofix valid/invalid

Signed-off-by: Patrick Venture <36c53fa43f47f3fd67cb2fc38031827244d18a1f@google.com>
Change-Id: I03511a471fb6ec41392e240b23cb141343d9cf70

openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid,openbmc/phosphor-host-ipmid