Fixing a space-before-paren issue may cross line length limit

[dar5hak]

We noticed in #146 that fixing a space-before-paren would add an extra character to the line, potentially crossing the length limit. This would regressively introduce one more lint issue, which wouldn't be detected until the next run.

Shouldn't be too common, since not many lines are exactly as long as the configured limit, but a problem nonetheless.