GtkBuilder: fixed a few minor memory leaks.
GtkBuilder: fixed a few minor memory leaks.

Fixed memory leaks in parse_object(), parse_template() and parse_signal() functions.
Parameters value where strduped before the last posible return and not freed.

alexlarsson/gtk,chergert/gtk,alexlarsson/gtk,Sidnioulz/SandboxGtk,Lyude/gtk-,ahodesuka/gtk,Lyude/gtk-,Sidnioulz/SandboxGtk,jessevdk/gtk,chergert/gtk,alexlarsson/gtk,ahodesuka/gtk,jigpu/gtk,grubersjoe/adwaita,ahodesuka/gtk,chergert/gtk,Lyude/gtk-,chergert/gtk,Lyude/gtk-,chergert/gtk,alexlarsson/gtk,grubersjoe/adwaita,Adamovskiy/gtk,grubersjoe/adwaita,Lyude/gtk-,jigpu/gtk,jadahl/gtk,jigpu/gtk,jigpu/gtk,Sidnioulz/SandboxGtk,Adamovskiy/gtk,grubersjoe/adwaita,jadahl/gtk,jessevdk/gtk,davidgumberg/gtk,Adamovskiy/gtk,Sidnioulz/SandboxGtk,jessevdk/gtk,chergert/gtk,alexlarsson/gtk,alexlarsson/gtk,chergert/gtk,grubersjoe/adwaita,Lyude/gtk-,Adamovskiy/gtk,Lyude/gtk-,jessevdk/gtk,jigpu/gtk,grubersjoe/adwaita,ahodesuka/gtk,jadahl/gtk,davidgumberg/gtk,jessevdk/gtk,Lyude/gtk-,jadahl/gtk,davidgumberg/gtk,Sidnioulz/SandboxGtk,ahodesuka/gtk,jadahl/gtk,ahodesuka/gtk,davidgumberg/gtk,chergert/gtk,Adamovskiy/gtk,ahodesuka/gtk,jessevdk/gtk,jadahl/gtk,Adamovskiy/gtk,jessevdk/gtk,Sidnioulz/SandboxGtk,grubersjoe/adwaita,Adamovskiy/gtk,davidgumberg/gtk,alexlarsson/gtk,jigpu/gtk,davidgumberg/gtk,grubersjoe/adwaita,ahodesuka/gtk,Adamovskiy/gtk,davidgumberg/gtk,jigpu/gtk,davidgumberg/gtk,alexlarsson/gtk,jadahl/gtk,jadahl/gtk,jigpu/gtk