Avoid dereferencing NULL pointer in gtk_label_drag_data_get()
Avoid dereferencing NULL pointer in gtk_label_drag_data_get()

It's possible the GtkLabel receives drag'n'drop related signals
if it was setup to receive them by a container or other external
code, just avoid dereferencing priv->select_info in this case.

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