Merge commit '4d11e4b47db6387077682595d53e9a17b50511cb' into release/2.4
* commit '4d11e4b47db6387077682595d53e9a17b50511cb':
libtwolame: prevent a NULL pointer dereference
See: a586b3d9b1
Merged-by: Michael Niedermayer <michaelni@gmx.at>
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