[media] gspca - main: Check the isoc packet status before its length
When an error is set for an isochronous packet, the length of the packet may be null. In this case, the error was not detected and the image was not discarded as it should be. Reported-by: NFranck Bourdonnec <fbourdonnec@chez.com> Signed-off-by: NJean-François Moine <moinejf@free.fr> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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