Fix issue #3391.
Fix issue #3391.

* subversion/libsvn_wc/crop.c
  (svn_wc_crop_tree): Do not pass NULL to strcmp.

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