loader: fix leak of child-to-parent links on dlclose() am: 772db5e6d4 am: 78b10daab3  -s ours am: dfb42b364d am: de4e1ef729 am: 62110f9538 am: cb3e51d006 am: b2792c701f am: 7ac2da9266 am: f62dc07af3 am: ca97abb2fb
am: 901c064d4d

Change-Id: If20d2edb9f544cb4d55a78a9c278c4dc01842b22