Decoder crash for stereo at 80kbps JBM decoding to Mono in get_scaling_quality_fx()

Basic info

• Float reference:
  • Encoder (float): f2eb9e08
  • Decoder (float):
• Fixed point:
  • Encoder (fixed):
  • Decoder (fixed): e4d04686

Bug description

The fixed point decoder crashes with an assert:

Assertion failed: (0), function L_add, file basop32.c, line 1661.

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1373

./IVAS_cod_flt_ref -q -stereo -max_band FB 80000 48 dp03a1s05_48.wav bit
networkSimulator_g192 ./scripts/dly_error_profiles/dly_error_profile_2.dat bit bit_sim netsim.trace 1 0
./IVAS_dec -voip mono 16 bit_sim out.wav