dignifiedquire / sonora / 24079284471

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fix(aec3): prevent panic when shrinking adaptive FIR filter (#15)

The `zero_filter` helper panicked when `old_size > new_size` because
Rust's range indexing (`h[old_size..new_size]`) is invalid when
start > end. The C++ original uses a `for` loop that naturally no-ops
in this case. Add an early return guard to match that behaviour.

Fixes #14

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