[SERIAL] 8250_pci: Remove redundant assignment, and mark fallthrough.

Signed-off-by: Dave Jones <davej@redhat.com>
diff --git a/drivers/serial/8250_pci.c b/drivers/serial/8250_pci.c
index 8d92adf..8adca0c 100644
--- a/drivers/serial/8250_pci.c
+++ b/drivers/serial/8250_pci.c
@@ -516,7 +516,7 @@
 		break;
 	case 3:
 		offset = board->uart_offset;
-		bar = 1;
+		/* FALLTHROUGH */
 	case 4: /* BAR 2 */
 	case 5: /* BAR 3 */
 	case 6: /* BAR 4 */