USAN: index 8 out of bounds for type 'int16_t [8]' in ivas_jbm_dec.c for ISM4 to STEREO decoding
### Basic info
- Commit SHA: 2f979d61204e9e0a7805f167a6245fb6e56af3c2
### Bug description
Clang USAN sanitizer test in pipeline found an error:
<!--- Copy sanitizer traceback from command line here -->
```
lib_dec/ivas_jbm_dec.c:2585:28: runtime error: index 8 out of bounds for type 'int16_t [8]'
SUMMARY: UndefinedBehaviorSanitizer: out-of-bounds-index lib_dec/ivas_jbm_dec.c:2585:28 in
```
<!--- Copy test job URL here -->
Link to test pipeline: https://forge.3gpp.org/rep/ivas-codec-pc/ivas-codec/-/jobs/241261
### Ways to reproduce
Using the [scripts](https://forge.3gpp.org/rep/ivas-codec-pc/ivas-codec/-/wikis/Software-development/pyivastest-howto#how-to-reproduce-tests):
<!--- check correct sanitizer type -->
<!--- add error pattern if needed -->
[dly_profile.dat](/uploads/6d328f5fd31c54957d21ce66565463be/dly_profile_20_.dat)
```
python3 scripts/IvasBuildAndRunChecks.py --checks CLANG3 -m ISM4_ball_fb_rs -p /path/to/my/local/ci_linux_ltv_local.json --usan_supp_file scripts/ubsan.supp -J dly_profile.dat --ism_metadata ltvISM1.csv ltvISM2.csv ltvISM3.csv ltvISM4.csv
```
or directly:
```
make clean
make -j CLANG=3
./IVAS_cod -ism 4 ltvISM1.csv ltvISM2.csv ltvISM3.csv ltvISM4.csv -max_band fb scripts/switchPaths/sw_32k_384k.bin 48 ltv48_4ISM.wav bit
networkSimulator_g192 dly_profile.dat bit bit_err trace_dump 1
./IVAS_dec -voip stereo 48 bit_err out.wav
```
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issue