Bug#861736:

[PICCA Frederic-Emmanuel <frederic-emmanuel.picca@synchrotron-soleil.fr>]

Let's instrument the code

        print filename, mode, _ref(self.handle)
        status = nxlib.nxiopen_(filename,mode,_ref(self.handle))
        print status

$ python bug.py
filenamenxs.h5 5 <cparam 'P' (0xb7488128)>
0