cssprovider: return immediately if there's remaining data behind a parsed value
cssprovider: return immediately if there's remaining data behind a parsed value

parse_value() could fill in a GError, but yet (incorrectly) return G_TOKEN_NONE,
having the GError leaked as a result.

https://bugzilla.gnome.org/show_bug.cgi?id=642604 , Reported by Felix Riemann.

jadahl/gtk,davidgumberg/gtk,bratsche/gtk-,simokivimaki/gtk,chergert/gtk,alexlarsson/gtk,jessevdk/gtk,davidgumberg/gtk,msteinert/gtk,Sidnioulz/SandboxGtk,jigpu/gtk,alexlarsson/gtk,Adamovskiy/gtk,jigpu/gtk,davidgumberg/gtk,Lyude/gtk-,Adamovskiy/gtk,Adamovskiy/gtk,jigpu/gtk,chergert/gtk,jessevdk/gtk,grubersjoe/adwaita,alexlarsson/gtk,chergert/gtk,chergert/gtk,bratsche/gtk-,Lyude/gtk-,bratsche/gtk-,msteinert/gtk,Lyude/gtk-,grubersjoe/adwaita,ebassi/gtk,Distrotech/gtk2,ahodesuka/gtk,simokivimaki/gtk,jigpu/gtk,Distrotech/gtk2,msteinert/gtk,Adamovskiy/gtk,jadahl/gtk,Sidnioulz/SandboxGtk,ahodesuka/gtk,simokivimaki/gtk,Sidnioulz/SandboxGtk,ebassi/gtk,bratsche/gtk-,grubersjoe/adwaita,ahodesuka/gtk,ebassi/gtk,grubersjoe/adwaita,jessevdk/gtk,msteinert/gtk,davidgumberg/gtk,jigpu/gtk,davidt/gtk,davidt/gtk,ahodesuka/gtk,simokivimaki/gtk,davidgumberg/gtk,Lyude/gtk-,grubersjoe/adwaita,ebassi/gtk,grubersjoe/adwaita,Lyude/gtk-,ahodesuka/gtk,alexlarsson/gtk,bratsche/gtk-,jessevdk/gtk,davidt/gtk,ebassi/gtk,jessevdk/gtk,simokivimaki/gtk,Adamovskiy/gtk,chergert/gtk,chergert/gtk,Sidnioulz/SandboxGtk,jadahl/gtk,chergert/gtk,davidt/gtk,grubersjoe/adwaita,alexlarsson/gtk,ahodesuka/gtk,jessevdk/gtk,ahodesuka/gtk,Sidnioulz/SandboxGtk,davidgumberg/gtk,msteinert/gtk,Distrotech/gtk2,jessevdk/gtk,jadahl/gtk,Lyude/gtk-,davidgumberg/gtk,Lyude/gtk-,davidt/gtk,ahodesuka/gtk,jigpu/gtk,ebassi/gtk,davidgumberg/gtk,jadahl/gtk,Distrotech/gtk2,chergert/gtk,jadahl/gtk,alexlarsson/gtk,jigpu/gtk,Lyude/gtk-,Distrotech/gtk2,Sidnioulz/SandboxGtk,msteinert/gtk,Adamovskiy/gtk,simokivimaki/gtk,Adamovskiy/gtk,Adamovskiy/gtk,alexlarsson/gtk,jadahl/gtk,jadahl/gtk,Distrotech/gtk2,bratsche/gtk-,davidt/gtk,grubersjoe/adwaita,alexlarsson/gtk,jigpu/gtk