libass: fix possible nullptr deref
vlc_stream_MemoryNew may return NULL. Which could be dereferenced by vlc_stream_ReadLine calls in OldEngineClunkyRollInfoPatch.
Fixes: #29363 (closed) (Coverity 1666281)
vlc_stream_MemoryNew may return NULL. Which could be dereferenced by vlc_stream_ReadLine calls in OldEngineClunkyRollInfoPatch.
Fixes: #29363 (closed) (Coverity 1666281)
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