invalid valgrind read errors

Using the current staging trunk packages, starting a guest session with bamfdaemon under valgrind, those errors are listed:

"==21512== Invalid read of size 4
==21512== at 0x48E53EC: g_type_check_instance_is_a (gtype.c:3960)
==21512== by 0x8073F4F: on_view_active_changed (bamf-matcher.c:122)
==21512== by 0x4E7B359: ffi_call_SYSV (in /usr/lib/i386-linux-gnu/libffi.so.6.0.0)
==21512== by 0x4E7B08E: ffi_call (in /usr/lib/i386-linux-gnu/libffi.so.6.0.0)
==21512== by 0x48C3493: g_cclosure_marshal_generic (gclosure.c:1189)
==21512== by 0x48C2F8B: g_closure_invoke (gclosure.c:774)
==21512== by 0x48D4844: signal_emit_unlocked_R (gsignal.c:3302)
==21512== by 0x48DC0C1: g_signal_emit_valist (gsignal.c:3033)
==21512== by 0x6E40967: ???
==21512== Address 0x7a40e38 is 0 bytes inside a block of size 112 free'd
==21512== at 0x402B06C: free (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==21512== by 0x4963B7A: standard_free (gmem.c:98)
==21512== by 0x4963CEF: g_free (gmem.c:252)
==21512== by 0x497811A: g_slice_free1 (gslice.c:1111)
==21512== by 0x48E4401: g_type_free_instance (gtype.c:1937)
==21512== by 0x48C6A7A: g_object_unref (gobject.c:3021)
==21512== by 0x48C453B: g_cclosure_marshal_VOID__VOID (gmarshal.c:85)
==21512== by 0x48C2F8B: g_closure_invoke (gclosure.c:774)
==21512== by 0x48D4844: signal_emit_unlocked_R (gsignal.c:3302)
==21512== by 0x48DC0C1: g_signal_emit_valist (gsignal.c:3033)
==21512==
==21512== Invalid read of size 4
==21512== at 0x47F92C5: call_in_idle_cb (gdbusconnection.c:4678)
==21512== by 0x495B4AF: g_idle_dispatch (gmain.c:4629)
==21512== by 0x495DA49: g_main_context_dispatch (gmain.c:2510)
==21512== by 0x495DE54: g_main_context_iterate.isra.21 (gmain.c:3118)
==21512== by 0x495E29A: g_main_loop_run (gmain.c:3312)
==21512== by 0x4A434D2: (below main) (libc-start.c:226)
==21512== Address 0x7a45c70 is 0 bytes inside a block of size 12 free'd
==21512== at 0x402B06C: free (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==21512== by 0x4963B7A: standard_free (gmem.c:98)
==21512== by 0x4963CEF: g_free (gmem.c:252)
==21512== by 0x47F40EB: exported_interface_free (gdbusconnection.c:3881)
==21512== by 0x494C297: g_hash_table_remove_node (ghash.c:484)
==21512== by 0x494CA19: g_hash_table_remove_internal (ghash.c:1274)
==21512== by 0x47FC93A: g_dbus_connection_unregister_object (gdbusconnection.c:5059)
==21512== by 0x481319A: remove_connection_locked (gdbusinterfaceskeleton.c:739)
==21512== by 0x48148D2: g_dbus_interface_skeleton_unexport (gdbusinterfaceskeleton.c:969)
==21512== by 0x806F89B: bamf_view_dispose (bamf-view.c:681)
==21512== by 0x48C6921: g_object_unref (gobject.c:2971)
==21512== by 0x48C453B: g_cclosure_marshal_VOID__VOID (gmarshal.c:85)
==21512== by 0x48C2F8B: g_closure_invoke (gclosure.c:774)
==21512== by 0x48D4844: signal_emit_unlocked_R (gsignal.c:3302)
==21512== by 0x48DC0C1: g_signal_emit_valist (gsignal.c:3033)
==21512==
==21512== Invalid read of size 4
==21512== at 0x8073F32: on_view_active_changed (bamf-matcher.c:122)
==21512== by 0x807424D: bamf_matcher_register_view (bamf-matcher.c:265)
==21512== by 0x8074FEE: handle_window_opened (bamf-matcher.c:1832)
==21512== by 0x48C5239: g_cclosure_marshal_VOID__OBJECT (gmarshal.c:644)
==21512== by 0x48C2F8B: g_closure_invoke (gclosure.c:774)
==21512== by 0x48D4844: signal_emit_unlocked_R (gsignal.c:3302)
==21512== by 0x48DC0C1: g_signal_emit_valist (gsignal.c:3033)
==21512== Address 0xd918fa0 is 0 bytes inside a block of size 112 free'd
==21512== at 0x402B06C: free (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==21512== by 0x4963B7A: standard_free (gmem.c:98)
==21512== by 0x4963CEF: g_free (gmem.c:252)
==21512== by 0x497811A: g_slice_free1 (gslice.c:1111)
==21512== by 0x48E4401: g_type_free_instance (gtype.c:1937)
==21512== by 0x48C6A7A: g_object_unref (gobject.c:3021)
==21512== by 0x48C453B: g_cclosure_marshal_VOID__VOID (gmarshal.c:85)
==21512== by 0x48C2F8B: g_closure_invoke (gclosure.c:774)
==21512== by 0x48D4844: signal_emit_unlocked_R (gsignal.c:3302)
==21512== by 0x48DC0C1: g_signal_emit_valist (gsignal.c:3033)
==21512== by 0x59B778F: ???"