usb: remove third argument of usb_maxpacket()

Now that all users of usb_maxpacket() have been migrated to only use
two arguments, remove the third variadic argument which was introduced
for the transition.
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/r/20220317035514.6378-9-mailhol.vincent@wanadoo.frSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/usb.h

@@ -1969,8 +1969,7 @@ usb_pipe_endpoint(struct usb_device *dev, unsigned int pipe)
 	return eps[usb_pipeendpoint(pipe)];
 }
 
-static inline u16 usb_maxpacket(struct usb_device *udev, int pipe,
-				/* int is_out deprecated */ ...)
+static inline u16 usb_maxpacket(struct usb_device *udev, int pipe)
 {
 	struct usb_host_endpoint	*ep;
 	unsigned			epnum = usb_pipeendpoint(pipe);