USB: serial: mct_u232: clean up urb->status usage

This done in anticipation of removal of urb->status, which will make
that patch easier to review and apply in the future.


Cc: <[e-mail]>
Cc: Wolfgang Grandegger <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/serial/mct_u232.c

···
 	struct usb_serial *serial = port->serial;
 	struct tty_struct *tty;
 	unsigned char *data = urb->transfer_buffer;
-	int status;
+	int retval;
+	int status = urb->status;
 	unsigned long flags;
 
-	switch (urb->status) {
+	switch (status) {
 	case 0:
 		/* success */
 		break;
···
 	case -ENOENT:
 	case -ESHUTDOWN:
 		/* this urb is terminated, clean up */
-		dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
+		dbg("%s - urb shutting down with status: %d",
+		    __FUNCTION__, status);
 		return;
 	default:
-		dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
+		dbg("%s - nonzero urb status received: %d",
+		    __FUNCTION__, status);
 		goto exit;
 	}
 
···
 #endif
 	spin_unlock_irqrestore(&priv->lock, flags);
 exit:
-	status = usb_submit_urb (urb, GFP_ATOMIC);
-	if (status)
+	retval = usb_submit_urb (urb, GFP_ATOMIC);
+	if (retval)
 		err ("%s - usb_submit_urb failed with result %d",
-		     __FUNCTION__, status);
+		     __FUNCTION__, retval);
 } /* mct_u232_read_int_callback */
 
 static void mct_u232_set_termios (struct usb_serial_port *port,