Add tests for Device dependent error information

Jan Breuer

2016-04-24 9b43058766282733ab8c2c290f4736e2d8bd5014

 libscpi/src/parser.c

@@ -593,10 +593,6 @@
    }
    result += writeData(context, "\"", 1);

#if USE_DEVICE_DEPENDENT_ERROR_INFORMATION
    SCPIDEFINE_free(&context->error_info_heap, error->device_dependent_info, false);
#endif

    return result;
}