[Non-BE] Resolve "Sanitizer issue in IGF with bitrate switch in SBA encoding mode"

• Related issues: #738 (closed)
• Requested reviewers: @tyagiri
• Link to longer test: https://forge.3gpp.org/rep/ivas-codec-pc/ivas-codec/-/jobs/152966

Reason why this change is needed

Fixes sanitizer issue in IGF for SBA bitrate switching

Description of the change

• Describe what is done.

Affected operating points

Non-Be in SBA Br switching