编译报错61: warning: initialization from incompatible pointer type报错

对应源码位置61行为：
59 // Sysfs definitions for hcsr04 class
60 static struct class_attribute hcsr04_class_attrs[] = {
61 __ATTR(value,        S_IRUGO | S_IWUSR, hcsr04_value_read, hcsr04_value_write),
62 __ATTR_NULL,
63 };