RFR: vcs: use correct loop variable

[Erik Helin]

Hi all,

please review this small patch that updates `DiffComparator.java` to use the correct loop variable (sigh).

Thanks,
Erik

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Commit messages:
 - vcs: use correct loop variable

Changes: https://git.openjdk.java.net/skara/pull/958/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=958&range=00
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/skara/pull/958.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/958/head:pull/958

PR: https://git.openjdk.java.net/skara/pull/958