Method ok

src/platforms/shared/spi_types.cpp.hpp:52–54

 FL_NOEXCEPT : mInternal(), error_code(err), is_ok(false) {}

bool DMABuffer::ok() const FL_NOEXCEPT {
    return is_ok && mInternal != nullptr;
}

fl::span<u8> DMABuffer::data() const FL_NOEXCEPT {
    if (!ok()) {