FFI interface not used properly in ngspice shared mode

[orjan-i-nilsson]

examples/ngspice-shared/voltage-divider.py crashes in simulation.
Ubuntu 14.04, PySpice 0.3.0, cffi.version=='1.8.3', ngspice revision 24

Shared.py:360 (called from ngspiceshared-imp)
self = ffi.from_handle(user_data) <<<<< says something about garbage data

Change(Shared.py:335)
self_c = ffi.new_handle(self) <<<<< local variable! will be garbage collected when method returns
to
self.self_c = ffi.new_handle(self)

and
ngspice_id_c = ffi.new('int *', self._ngspice_id)
to
self.ngspice_id_c = ffi.new('int *', self._ngspice_id)

[FabriceSalvaire]

Indeed this code must be checked and with the latest CFFI release.

[FabriceSalvaire]

Still missing something ???

Shared.py:360 (called from ngspiceshared-imp)
self = ffi.from_handle(user_data) <<<<< says something about garbage data