[SERIAL] Fix typo in comment

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index b1fc97d..244e8ff 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2198,7 +2198,7 @@
 	touch_nmi_watchdog();
 
 	/*
-	 *	First save the UER then disable the interrupts
+	 *	First save the IER then disable the interrupts
 	 */
 	ier = serial_in(up, UART_IER);