Fix warnings in preparation for Rust 1.53.0

This CL fixes several new warnings generated by rustc 1.53.0.

Bug: 194400612
Test: m rust
Change-Id: I8550211f578da81761aaa1ac475c3860657fc907
4 files changed
tree: ccedc37f1d47355d20353acb9ae7a616418f6f0c
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/
  5. rust/
  6. OWNERS
  7. PREUPLOAD.cfg
  8. TEST_MAPPING