rust: remove redundant format in unreachable am: ff062d54f9 am: 7d8dde4b8f am: 2d4d0158ac

Original change: https://android-review.googlesource.com/c/platform/external/minijail/+/2058807

Change-Id: If0f66e449b9dcadc0b471bcba6ee7fbadea88acc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>