V4L/DVB (10226): zoran: Get rid of extra module ref count

The zoran driver does a module_get/put of THIS_MODULE on device open/close.
This isn't necessary as the kernel does this automatically.

Clean up the failure path of zoran_open() somewhat.

Make the dprintk()s on open/close a higher debug level and make the user
count printed take the current open/close into account.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>