Unmount public volume if FUSE mount fails am: f71707916f am: c1f45db6e1 am: 3875f982dc

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/vold/+/11900947

Change-Id: I55d927eb0b7067aea68287dd5d89383ca4a45d9b