[regression] Decoder crash for Stereo JBM decoding at 80kbps in normalized_cross_correlation_self_fx()
# Basic info
<!--- Add commit SHA used to reproduce -->
* Float reference:
* Encoder (float): c21351165b0cace2fd8686b3935ed074b0f99ba2
* Decoder (float): c21351165b0cace2fd8686b3935ed074b0f99ba2
* Fixed point:
* Decoder (fixed): 7e820311176f5319416dc4e8571404206d62343b
# Bug description
The fixed point decoder crashes with an assert:
```
Assertion failed: (0), function L_add, file basop32.c, line 1661.
```
{width=383 height=269}
# Ways to reproduce
Box folder: ...\Box_EXTERNAL_IVAS_BASOP_VERIFICATION\issues\issue-1824
<!-- Commandline or script -->
```bash
./IVAS_cod_flt_ref -stereo -max_band FB 80000 48 dp03a5s03_48.wav bit
networkSimulator_g192 dly_error_profile_6.dat bit bit_sim trace 1 0
./IVAS_dec_fx -voip stereo 16 bit_sim out.wav
```
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issue