staging: usbip: reformat function pickup_urb_and_free_priv

re-indent funtion "pickup_urb_and_free_priv" to improve readability.

Signed-off-by: Stefan Reif <ke42caxa@cip.cs.fau.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>