Distribution/Version: gentoo

If you want to use the function gnome_vfs_get_file_info_uri() you have to
provide the uri and the GnomeVFSFileInfo. If you forget to initialize the
GnomeVFSFileInfo field with the method gnome_vfs_file_info_new () you got an
segmentation fault.

To avoid this, I have created a patch against gnome-vfs-cancellable-ops.c file
where I have added a g_return_val_if_fail call to inform the developer (and
user) that something is wrong but no more segmentation fault. In this way we
don't need to update the documentation but it would be fine to add an hint that
the developer has to initialize the GnomeVFSFileInfo field.