i2c_addr_reserved
if (i2c_addr_reserved(&scan->scan_addr)) {
extern bool i2c_addr_reserved(const i2c_addr_t *);
if (!i2c_addr_reserved(&addr)) {
if (!i2c_addr_reserved(&addr)) {
if (!i2c_addr_reserved(&addr)) {
if (!i2c_addr_reserved(&addr)) {
if (i2c_addr_reserved(&addr)) {
if (i2c_addr_reserved(&addr)) {