Fix analyzer warnings in the YAML package.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//277593005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/yaml@35939 260f80e4-7a28-3924-810f-c04153c831b5
3 files changed
tree: bf9c3eedc315f53873fc715afd58fb0f9d655c77
  1. pkgs/