GtkTreeView: plug a leaking GtkTreeRowReference
GtkTreeView: plug a leaking GtkTreeRowReference

This is exposed by overshooting in a HildonPannableArea. Leaking
a GtkTreeRowReference also means leaking the whole model, since
the GtkTreeModel reference count is increased for each row
reference.

Fixes bug #607770 - Leak in GtkTreeView with HildonPannableArea

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