loader: fix leak of child-to-parent links on dlclose() am: 46c3aa2c0e  -s ours am: 02b94ea8ff am: 623d83754a am: 254aec13d0 am: c65740f4a5 am: 59abd613d4 am: 2514cb784d
am: f3537c61bf

Change-Id: Ib97ef3be452422f32390457047d64b17c02ac9e0