[media] radio-shark*: Remove work-around for dangling pointer in usb intfdata

Recent kernels properly clear the usb intfdata pointer when another
driver fails to bind (in the radio-shark* case the usbhid driver would try
to bind first.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>