RFR: checkout: sort marks before converting

[Erik Helin]

Hi all,

please review this small patch that ensures that we sort the existing marks before passing them to the converter.

Thanks,
Erik

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Commit messages:
 - checkout: sort marks before converting

Changes: https://git.openjdk.java.net/skara/pull/995/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=995&range=00
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/995.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/995/head:pull/995

PR: https://git.openjdk.java.net/skara/pull/995