Follow-up to r40349 and r40352, squelch a Windows-only compiler warning.
Follow-up to r40349 and r40352, squelch a Windows-only compiler warning.

* subversion/libsvn_subr/io.c
  (svn_io_open_unique_file3): Stop unreferenced local variable warning.

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