kernel/ksysfs.c: use helper macro __ATTR_RW

Use helper macro __ATTR_RW to define kobj_attribute to make code more
clear.  Minor readability improvement.

Link: https://lkml.kernel.org/r/20220222112034.48298-1-linmiaohe@huawei.comSigned-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/ksysfs.c

@@ -24,8 +24,7 @@
 static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
 
 #define KERNEL_ATTR_RW(_name) \
-static struct kobj_attribute _name##_attr = \
-	__ATTR(_name, 0644, _name##_show, _name##_store)
+static struct kobj_attribute _name##_attr = __ATTR_RW(_name)
 
 /* current uevent sequence number */
 static ssize_t uevent_seqnum_show(struct kobject *kobj,