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: Ife13b269492a0fb0d51cf24e321e6016ade7a70b
Signed-off-by: Automerger Merge Worker <[email protected]>