afp: Use g_clear_object properly
afp: Use g_clear_object properly

g_clear_object expects the address of a pointer. A recent
change in its definition makes gcc complain about this.

gicmo/gvfs,halfline/gvfs,gicmo/gvfs,philipl/gvfs,philipl/gvfs,gicmo/gvfs,xkahn/gvfs-cmis,xkahn/gvfs-cmis,philipl/gvfs,halfline/gvfs,xkahn/gvfs-cmis,halfline/gvfs,gicmo/gvfs,xkahn/gvfs-cmis