Fix crash due access to uninitialized pointer. I don't know exact reproduction script, but crash was reported multiple times using TortoiseSVN crash reporter tool.
Fix crash due access to uninitialized pointer. I don't know exact reproduction
script, but crash was reported multiple times using TortoiseSVN crash reporter
tool.

* subversion/libsvn_client/merge.c
  (merge_reintegrate_locked): Initialize output parameter *CONFLICT_REPORT to
   NULL if no merge source was found.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1701997 13f79535-47bb-0310-9956-ffa450edef68

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