daemon: Use g_clear_object wherever applicable
daemon: Use g_clear_object wherever applicable

https://bugzilla.gnome.org/show_bug.cgi?id=693578

halfline/gnome-online-accounts,halfline/gnome-online-accounts,Distrotech/gnome-online-accounts,felipeborges/gnome-online-accounts,ritzk/gnome-online-accounts,Distrotech/gnome-online-accounts,Distrotech/gnome-online-accounts,halfline/gnome-online-accounts,ritzk/gnome-online-accounts,felipeborges/gnome-online-accounts,felipeborges/gnome-online-accounts,ritzk/gnome-online-accounts