rust: fix some tricium warnings in 1.47.0 ebuild

BUG=None
TEST=sudo emerge virtual/rust

Change-Id: I3bb51c3128e332db1878fef5e937635082cbdeb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2500411
Reviewed-by: George Burgess <gbiv@chromium.org>
Reviewed-by: Tiancong Wang <tcwang@google.com>
Reviewed-by: Navil Perez <navil@google.com>
Tested-by: Bob Haarman <inglorion@chromium.org>
Tested-by: Navil Perez <navil@google.com>
(cherry picked from commit 5f990899f5d89ef758a279a3c1c772ed42fb2756)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2508440
Commit-Queue: Navil Perez <navil@google.com>
2 files changed