asfdec: only set asf_pkt->data_size after sanity checks
Otherwise invalid values are used unchecked in the next run. This can cause NULL pointer dereferencing. Signed-off-by: NAndreas Cadhalpun <Andreas.Cadhalpun@googlemail.com> Signed-off-by: NAlexandra Hájková <alexandra.khirnova@gmail.com> Signed-off-by: NAnton Khirnov <anton@khirnov.net>
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