staging: comedi: dyna_pci10xx: fix detach

The detach for this driver is missing the check to make sure
that the pci device is enabled before disabling it.

It's also missing the pci_dev_put().

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>