message: Fix a test assertion
diff: @@ -635,7 +635,7 @@ required by package `foo v0.0.1 ([..])`
  .run();
  p.cargo("update -p baz")
  - .with_status(101)
  + .with_status(0)
  .with_stderr_contains(
  "\
  [UPDATING] `[..]` index
  