On the issue-3220-dev branch, fix a segfault scenario.
On the issue-3220-dev branch, fix a segfault scenario.

* subversion/libsvn_repos/log.c
  (fs_mergeinfo_changed): Initialize some variables.

By the way, initial results from the work done so far indicate that
this new approach is, in fact, far more accurate than the old code.
And a recent performance comparison showed this code taking 12 seconds
to do what the old code did (incorrectly, even) in nearly 6 minutes.

git-svn-id: cf33cc67c16fde8a5d3786d5500d1d585aadebea@872215 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion