[PATCH] cpqphp: fix oops during unload without probe

drivers/pci/hotplug/cpqphp_core.c calls cpqphp_event_start_thread()
in one_time_init(), which is called whenever the hardware is probed.
Unfortunately, cpqphp_event_stop_thread() is *always* called when
the module is unloaded. If the hardware is never probed, then
cpqphp_event_stop_thread() tries to manipulate a couple of
uninitialized mutexes.

Signed-off-by: Keith Moore <keithmo@exmsft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>