[non-BE] Fix crash in McMASA to custom LS output
- Related issues: #1250 (closed)
- Requested reviewers:
Reason why this change is needed
- Crash in McMASA to custom LS output.
Description of the change
- Skip LFE channel processing when this channel does not exist.
Affected operating points
- BE on self-test but solves a crash in specific custom LS setups.