comedi_calibrate patches for ni pci-6035e with "init_setup() failed" problem

[wei jiang]

I found the problem is with the "comedi_calibrate/comedi_calibrate/
ni.c"

The function: "static int ni_setup_ao_observables( calibration_setup_t
*setup )" is supposed to return 0 when success and -1 when fail. But I
find that it has a normal path of exit without return sentence, that
cause the return value undefined.

So add one line "return 0" just before the last line of this function
solved the "init_setup() failed" problem for my PCI-6035e.

[Ian Abbott]

Thanks for catching that. It was a result of one of my recent changes.
It's fixed in git now.

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