Fix a message bug.

If a point span appeared past the end of a file, and that file *didn't*
end with a trailing newline, that span would be printed as though it
pointed at the last character of the file.

R=jmesserly@google.com

Review URL: https://codereview.chromium.org//2056913002 .
4 files changed
tree: 8f2e43bc1002e33bd3a3afb4c2b5ad7138dd8901
  1. pkgs/