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[NON-BE] Fix msan error in TD concealment in MDCT-Stereo

Jan Kienerequested to merge
fhg/fix-bug-in-td-concealment-for-mdct-stereo into main

Reason why this change is needed

  • Fixes a bug in MDCT-Stereo TD concealment

Description of the change

  • For consecutive frames being lost, the decoder fades to background noise. For TD concealment, LSPs are faded towards background noise LSPs. If the conversion from LPC coefficients can not be done in a stable way, the old LSPs should be used, but weren't. This minor fix applies the correct behaviour.

Affected operating points

  • All modes using MDCT-Stereo core ifmore than one frame is lost and concealed with ACELP concealment in the rare case of conversion to LSP being non-stable.
  • decoder PLC change only, so bitstream is not affected

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