comedilib.h: Don't mark 'data' parameter of comedi_data_read_n for SWIG
comedilib.h: Don't mark 'data' parameter of comedi_data_read_n for SWIG

The 'data' parameter (of type lsampl_t*) for
comedi_data_read_n(it,subd,chan,range,aref,data,n) is currently marked
as an OUTPUT parameter for SWIG, but we can only do that for single
objects, and this one points to an array of objects.

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