DLS: fix loop calculation for 16-bit am: 97f70ed81d am: 4f077e4de6 am: 1d91606a62

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/sonivox/+/18349826

Change-Id: If6bd4cf6d235109e40c6ebbb1239bed11a1aa80e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>