Fix Win32/OSX failures of log sensitive tests log_tests.py 17, 19.
Fix Win32/OSX failures of log sensitive tests log_tests.py 17, 19.

* subversion/libsvn_repos/log.c
  (do_merged_log): Initialize svn_boolean_t changed since it is not
  guaranteed a value upon return from check_history().


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@865607 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion