rust: remove redundant format in unreachable am: ff062d54f9 am: 7d8dde4b8f am: 2d4d0158ac am: 0a1a6fd4ae

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

Change-Id: I7beae46fe3c8eef08ed1547c8bc17cfeb60578ac
Signed-off-by: Automerger Merge Worker <[email protected]>