PATCH: gscpav2-0.0.29 some minor fixes

Hi Jef,

Here are 2 minor fixes from my previous patch set which didn't make it in 0.0.29.

1) vidioc_s_parm currently takes the usb_lock, but it doesn't do anything with
    usb nor call any sd functions, so there is no need, really no need at all to
    take the usb lock, if you disagree please explain why.

2) Replace wait_event_interruptible with wait_event_interruptible_timeout, if
    for whatever reason the isoc flow stops, the applications should get an IO
    error, not hang indefinitely.

Regards,

Hans

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