[non-BE] [allow-regression] Resolve "MSAN with -O2 option : use-of-uninitialized-value in lib_dec/ivas_ism_metadata_dec.c:532:10"

vaclavrequested to merge
float-1547-msan-with-o2-option-use-of-uninitialized-value-in-lib_dec-ivas_ism_metadata_dec-c-532-10 into main

Reason why this change is needed

  • MSAN with -O2 option : use-of-uninitialized-value in lib_dec/ivas_ism_metadata_dec.c:532:10

Description of the change

  • Correct bug in decoded metadata in ISM DTX.

Affected operating points

  • not-BE for ISM DTX decoder (BE for OMASA and OSBA as DTX is not used there)

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