Follow-up to r32638:
Follow-up to r32638:

* subversion/libsvn_client/export.c
  (svn_client_export4):
    Enforce that PEG_REVISION and REVISION are not NULL.

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