media file: fix exception when getting frame count of corrupted gif.

Fix a `gifload: no frames in GIF` error from libvips when trying to read
the frame count for https://danbooru.donmai.us/media_assets/1141668.
This commit is contained in:
evazion
2022-10-31 02:14:44 -05:00
parent 214a877c3c
commit dfd19f3ad4
3 changed files with 20 additions and 1 deletions

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