Handle errors on partition close am: b1c0524f1c

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/2877134

Change-Id: I2d22391b00f5c5dc7536f3e9059015a423ff4183
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>