ART: Minor cleanup in cmdline/. am: 714328e2d2

Original change: https://android-review.googlesource.com/c/platform/art/+/2049863

Change-Id: I0178fc695b4db7725f0d942e649edd7682d33a33
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>