[media] videobuf: fix sparse warnings
videobuf-core.c:834:23: warning: Using plain integer as NULL pointer videobuf-core.c:851:28: warning: Using plain integer as NULL pointer Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>
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