[rend-non-BE][non-BE] Resolve: "IVAS_dec segfault"

Mohammadreza Naghibzadehrequested to merge
basop-2505-ivas_dec-segfault into main

Reason why this change is needed

  • Overflow in ivas_mdft_fx() for ISM rendering with RENDERER_BINAURAL_MIXER_CONV_ROOM

Description of the change

  • Introduce an addition scaling taking guard bits into account

Affected operating points

  • Rendering of ISM with BINAURAL_ROOM_IR might not be bit-exact.
Edited by multrus

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