PNP / card: add missing put_device() call

This is required so that we give up the last reference to the device.

Signed-off-by: Levente Kurusa <levex@linux.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Merge branch 'pnp' into bleeding-edge

* pnp:
  PNP / card: add missing put_device() call