Modify-env: Resource leak fixed.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2425 ba6dc0ae-232f-0410-883f-9ebac64fc565
Minor leak fixed in coord lookup-service.

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2426 ba6dc0ae-232f-0410-883f-9ebac64fc565