[pwc] [PATCH] pwc: do not block in VIDIOC_DQBUF

[Andrea]

I think the ioctl VIDIOC_DQBUF in pwc does not follow the API spec.
It should not block if there are no buffers and the device has been
opened with O_NONBLOCK.

I am not sure the patch is 100% correct, since I do not understand it
completely.

Andrea
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