Fix a small typo in svn_checksum_match()
Fix a small typo in svn_checksum_match()

* subversion/libsvn_subr/checksum.c
  (svn_checksum_match): test d2 for NULL-ness, rather than d1 twice.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@872602 13f79535-47bb-0310-9956-ffa450edef68

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