Fix typo in ioc4_serial.c

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.13-mm1/drivers/serial/ioc4_serial.c
===================================================================
--- linux-2.6.13-mm1.orig/drivers/serial/ioc4_serial.c	2005-09-02 09:31:11.000000000 -0700
+++ linux-2.6.13-mm1/drivers/serial/ioc4_serial.c	2005-09-02 09:49:47.000000000 -0700
@@ -2331,7 +2331,7 @@ static void receive_chars(struct uart_po
 
 	tty = info->tty;
 
-	request_count = tty_request_room(tty, IOC4_MAX_CHARS - 2);
+	request_count = tty_buffer_request_room(tty, IOC4_MAX_CHARS - 2);
 
 	if (request_count > 0) {
 		icount = &the_port->icount;