loader: fix leak of child-to-parent links on dlclose() am: 772db5e6d4 am: 78b10daab3  -s ours am: dfb42b364d am: de4e1ef729 am: 62110f9538
am: cb3e51d006

Change-Id: I17db0fafc84cda99bb401efcca497342b9ad4d9a