lavc/decode: do not clear the frame discard flag in ff_decode_frame_props_from_pkt()

Only do it in reget_buffer().

The purpose of this clearing this flag is to prevent it for
unintentionally persisting across multiple invocations of this function
on one frame, however that is only a problem if the frame is not
unreffed between uses, which is only the case with reget_buffer().

In other cases the caller may legitimately want to set the discard flag
and should have the option of doing so.

0 files changed, 0 insertions, 0 deletions