Prevent svnadmin loads of partial dumps from possibly creating invalid mergeinfo where the start range > end range.
Prevent svnadmin loads of partial dumps from possibly creating invalid
mergeinfo where the start range > end range.

* subversion/libsvn_repos/load.c

  (renumber_mergeinfo_revs): Yet another fix for issue #3020; if we can't
   remap a mergeinfos start rev, then don't attempt to remap the end
   range.  We might succeed and load invalid mergeinfo.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion