Drop initialization of structure fields to NULL

It's unneeded as API documentation of g_new0 says:
"Allocates n_structs elements of type struct_type, initialized to 0's."

See http://developer.gnome.org/glib/2.30/glib-Memory-Allocation.html#g-new0 for details.

Open-webOS-DCO-1.0-Signed-off-by: Simon Busch <morphis@gravedo.de>