Fix divide-by-zero when calculating signal level over a large output range.
Fix divide-by-zero when calculating signal level over a large output range.

Change-Id: I17eff6fb458532465a836414e1973a8d5b7c715b

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base