HID: make .raw_request mandatory

SET_REPORT and GET_REPORT are mandatory in the HID specification.
Make the corresponding API in hid-core mandatory too, which removes the
need to test against it in some various places.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 60f3ff7..5eb282e 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -992,11 +992,8 @@
 	if (len < 1 || len > HID_MAX_BUFFER_SIZE || !buf)
 		return -EINVAL;
 
-	if (hdev->ll_driver->raw_request)
-		return hdev->ll_driver->raw_request(hdev, reportnum, buf, len,
+	return hdev->ll_driver->raw_request(hdev, reportnum, buf, len,
 						    rtype, reqtype);
-
-	return -ENOSYS;
 }
 
 /**