USB: add bulk_in_size for usb-serial devices.

Don't know why I didn't do it before...
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/usb/serial/usb-serial.c

@@ -1047,6 +1047,7 @@ int usb_serial_probe(struct usb_interface *interface,
 			goto probe_error;
 		}
 		buffer_size = endpoint->wMaxPacketSize;
+		port->bulk_in_size = buffer_size;
 		port->bulk_in_endpointAddress = endpoint->bEndpointAddress;
 		port->bulk_in_buffer = kmalloc (buffer_size, GFP_KERNEL);
 		if (!port->bulk_in_buffer) {

drivers/usb/serial/usb-serial.h

@@ -100,6 +100,7 @@ struct usb_serial_port {
 	__u8			interrupt_in_endpointAddress;
 
 	unsigned char *		bulk_in_buffer;
+	int			bulk_in_size;
 	struct urb *		read_urb;
 	__u8			bulk_in_endpointAddress;