Fix a stupid bug that slipped through the cracks in r11978.
Fix a stupid bug that slipped through the cracks in r11978.

* subversion/tests/libsvn_subr/string-test.c
  (test_stringbuf_unequal): Renamed from test_string_compare. Return
   an appropriate svn_error_t* instead of a boolean.
  (test22, test23): Let test_stringbuf_unequal do all the work.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@852056 13f79535-47bb-0310-9956-ffa450edef68

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