avfilter/vf_scale: fix frame lifetimes

scale_frame() inconsistently handled the lifetime of `in`. Fixes a
possible double free and a possible memory leak.

The new code always has `scale_frame` take over ownership of the input
frame. I first tried writing this code in a way where the calling code
retains ownership, but this is nontrivial due to the presence of the
no-op short-circuit condition in which the input frame is directly
returned. (As an alternative, we could use av_frame_clone() instead, but
I wanted to avoid touching the original behavior in this commit)

0 files changed, 0 insertions, 0 deletions