picture: fix potential use-after-free on error

picture_InternalClone can fail and return NULL, so the clone picture must not be used in case of error.

Regression from e0b6a09a.

changed milestone to %4.0

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added 10 commits

• b2adfc2a...7a914bfc - 9 commits from branch videolan:master
• 18339865 - picture: fix potential use-after-free on error

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merged