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
am: be8327ce71

Change-Id: Icd38c97287d0f2215bc4677f7c4f971badd9b6fa