drivers/tty/serial/serial_core.c: clean up HIGH_BITS_OFFSET usage

serial_core.c usually does

if (HIGH_BITS_OFFSET)
expr-involving-HIGH_BITS_OFFSET()

at least to avoid generating useless code on 32-bit machines, where
HIGH_BITS_OFFSET is zero. Do that in uart_get_attr_port().

Cc: Alan Cox <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/serial/serial_core.c

···
 {
 	struct serial_struct tmp;
 	struct tty_port *port = dev_get_drvdata(dev);
+	unsigned long ioaddr;
 
 	uart_get_info(port, &tmp);
-	return snprintf(buf, PAGE_SIZE, "0x%lX\n", (unsigned long)(tmp.port | (((unsigned long)tmp.port_high) << HIGH_BITS_OFFSET)));
+	ioaddr = tmp.port;
+	if (HIGH_BITS_OFFSET)
+		ioaddr |= (unsigned long)tmp.port_high << HIGH_BITS_OFFSET;
+	return snprintf(buf, PAGE_SIZE, "0x%lX\n", ioaddr);
 }
 
 static ssize_t uart_get_attr_irq(struct device *dev,