parsed_uri.port is only valid iff parsed_uri.port_str != NULL.

  Old code simply checked if it was non-zero, not if it
  was *valid*


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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@101775 13f79535-47bb-0310-9956-ffa450edef68