* subversion/libsvn_client/repos_diff.c   (open_root): Remove redundant check for the target being NULL.
* subversion/libsvn_client/repos_diff.c
  (open_root): Remove redundant check for the target being NULL.

Found by: Coverity <http://scan.coverity.com>
(CID: 22)

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