[media] media: vb2: fix incorrect return value
This patch fixes incorrect return value. Errors should be returned as negative numbers. Reported-by: NTomasz Stanislawski <t.stanislaws@samsung.com> Signed-off-by: NMarek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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