i2c_ctrl_path
len = strlcat(buf, i2c_ctrl_path(arg->icl_ctrl), buflen);
extern const char *i2c_ctrl_path(i2c_ctrl_t *);
if (strcmp(i2c_ctrl_path(ctrl), i2c_ctrl_path(alt)) != 0) {
i2c_ctrl_path(ctrl), i2c_ctrl_path(alt));