loader: fix leak of child-to-parent links on dlclose() am: 46c3aa2c0e  -s ours am: 02b94ea8ff am: 623d83754a am: 254aec13d0 am: c65740f4a5
am: 59abd613d4

Change-Id: I1f1fd31090a9a2bc2d3c1472558d2b2dc2993c40