audio_utils: Avoid integer constant -0x80000000 am: cc713f4b45

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/media/+/18570312

Change-Id: I61689b68b50bc6e31717e75b42614918ad1c9adc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>