This patch adds pci_disable_device in the appropriate places to
eliminate the following message when removing the module.

pcnet32 0000:00:05.0: Device was removed without properly calling pci_disable_device(). This may need fixing.
pcnet32 0000:02:05.0: Device was removed without properly calling pci_disable_device(). This may need fixing.

Tested ia32.
signed-off-by: Don Fry <brazilnut@us.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>