USB HID: fix bogus comment in hid_get_class_descriptor()

The comment in hid_get_class_descriptor() says a very obvious thing
and is also violating codingstyle. Just remove it.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/usb/input/hid-core.c

@@ -485,7 +485,7 @@ static int hid_get_class_descriptor(struct usb_device *dev, int ifnum,
 {
 	int result, retries = 4;
 
-	memset(buf,0,size);	// Make sure we parse really received data
+	memset(buf, 0, size);
 
 	do {
 		result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),