i2c_errmsg
i2c_errmsg(hdl), i2c_errtostr(hdl, i2c_err(hdl)),
scan->scan_error = strdup(i2c_errmsg(hdl));
scan->scan_error = strdup(i2c_errmsg(hdl));
extern const char *i2c_errmsg(i2c_hdl_t *);
i2c_errmsg(hdl), i2c_errtostr(hdl, i2c_err(hdl)),