Fix bug, when user doesn't enter the port number for xfrin command, the xfrin shouldn't crash.
git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@1569 e5f2f494-b856-4b98-b285-d166d9295462
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git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@1569 e5f2f494-b856-4b98-b285-d166d9295462