PCI Hotplug: pciehp: Dont check bridge control on remove

When removing a device with a bridge on it, only read the
bridge control register if the adapter is actually present.

Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>