8250 revision width fix

diff -prauN mm8-2.5.69-1/drivers/serial/8250.c mm8-2.5.69-2/drivers/serial/8250.c
@@ -124,7 +124,7 @@ struct uart_8250_port {
 	struct list_head	list;		/* ports on this IRQ */
 	unsigned char		acr;
 	unsigned char		ier;
-	unsigned char		rev;
+	unsigned short		rev;
 	unsigned char		lcr;
 	unsigned char		mcr_mask;	/* mask of user bits */
 	unsigned char		mcr_force;	/* mask of forced bits */