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 ``` <!--- Below are labels that will be added but are not shown in description. This is a template to help fill them. Add further information to the first row and remove and add labels as necessary. -->
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