mp4: fix null deref

This used one too many derefs, and then due to the earlier write of null near the beginning of the function (making a null write here redundant) there was thus a null-deref.

Regression from 0e9db4f7.

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requested review from @fcartegnie

approved this merge request

added MRStatus::Acceptable label and removed MRStatus::Reviewable label

approved this merge request

I guess that was a superfluous *ppp_attach=NULL that when double pointer wrong

added MRStatus::Accepted label and removed MRStatus::Acceptable label

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added Component::Demuxers: MP4 label

added 89 commits

• 318a75e7...de3a522a - 88 commits from branch videolan:master
• 8a88f100 - mp4: fix null deref

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enabled an automatic merge when the pipeline for 8a88f100 succeeds

merged

changed milestone to %4.0