Fix an analyzer error in the linux directory watcher.

R=rnystrom@google.com
BUG=

Review URL: https://codereview.chromium.org//65533005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/watcher@30093 260f80e4-7a28-3924-810f-c04153c831b5
1 file changed
tree: 495c77b03a8e935778e86dc907a240a1b2c9ab3b
  1. pkgs/