loader: fix leak of child-to-parent links on dlclose() am: 46c3aa2c0e  -s ours am: 02b94ea8ff am: 623d83754a am: 254aec13d0
am: c65740f4a5

Change-Id: I59cea9af44bfa75e1a9f7f4c780396f2d3f606db