IB: fix dlopen bug

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2774 ba6dc0ae-232f-0410-883f-9ebac64fc565
IB: minor fix

git-svn-id: svn://svn.code.sf.net/p/dmtcp/code/trunk@2775 ba6dc0ae-232f-0410-883f-9ebac64fc565