avfilter/vf_subtitles: Fix leaks on failure

init_subtitles() sometimes returned directly upon error without cleaning
up after itself. The easiest way to trigger this is by using
picture-based subtitles; it is also possible to run into this in case of
missing decoders or allocation failures.

Furthermore, return the proper error code in case of missing decoder.

Reviewed-by: Nicolas George <[email protected]>
Reviewed-by: Paul B Mahol <[email protected]>
Signed-off-by: Andreas Rheinhardt <[email protected]>

0 files changed, 0 insertions, 0 deletions