[Bug 732734] v4l2src: Seems to leak fd when camera is unplugged

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732734
  GStreamer | gst-plugins-good | git

--- Comment #10 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> 2015-01-08 16:31:35 UTC ---
Btw, 19 is ENODEV, in V4L2 context it's very clear:

"Device not found or was removed."

I don't see any error reported by STREAMOFF for which we would still be
streaming. There is only EBUSY, but it make no sense, this is what other ioctl
may return if STREAMOFF need to be called first. This would be a deadend.

So the change I would do is to warn on error, but still assume we are no longer
streaming. This way, at worst other call will fail later and device will be
closed properly (the only solution when the device is not responding).

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