[media] videobuf2: Fix a bug in fileio emulation error handling
Various error paths in fileio_init where not setting the request-count to 0 when unrequesting the buffers on error to init the fileio emulation. Signed-off-by: NHans de Goede <hdegoede@redhat.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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