remove module * parameter from class_create()

From v6.4, class_create() does not have module *

From linux commit aaba11da9aa7d7d6b52a74d45b31cac118295a1
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driver core: class: remove module * from class_create()

The module pointer in class_create() never actually did anything, 
and it shouldn't have been requred to be set as a parameter even 
if it did something.  So just remove it and fix up all callers of the 
function in the kernel tree at the same time.

examples/chardev.c

@@ -62,7 +62,7 @@ static int __init chardev_init(void)
 
     pr_info("I was assigned major number %d.\n", major);
 
-    cls = class_create(THIS_MODULE, DEVICE_NAME);
+    cls = class_create(DEVICE_NAME);
     device_create(cls, NULL, MKDEV(major, 0), NULL, DEVICE_NAME);
 
     pr_info("Device created on /dev/%s\n", DEVICE_NAME);