[regression] Decoder segfault for Stereo at 24.4 / 32 kbps FER in ivas_spec_ana_fx()

Basic info

• Float reference:
  • Encoder (float): c2135116
  • Decoder (float): c2135116
• Fixed point:
  • Decoder (fixed): 7e820311

Bug description

The fixed point decoder crashes with a segfault (overflow pointer is NULL in shr):

Ways to reproduce

Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1823

./IVAS_cod_flt_ref -stereo -max_band FB 24400 48 ap03a3s02_48.10dB.wav bit
eid-xor -vbr -fer bit error_patterns/stereo-mixed-music.ap03a3s02_ep.192 bit_err
./IVAS_dec_fx mono 48 bit_err out.wav

This crash occurs for both 24.4 and 32kbps decoding to either mono or stereo.