Fix bugprone-unused-return-value clang-tidy issues am: 94383b4038 am: d4759e125c am: 72a08a3384 am: 84191d34d2

Original change: https://android-review.googlesource.com/c/platform/art/+/2203655

Change-Id: If07ab9e31a4ac9caa1232aa6c01307b5488a3f46
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>