serial: 8250_em: Add missing break statement

Add missing break statement in serial8250_em_serial_out().

Suggested-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20230227114152.22265-5-biju.das.jz@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_em.c

@@ -42,6 +42,7 @@ static void serial8250_em_serial_out(struct uart_port *p, int offset, int value)
 	case UART_DLL_EM: /* DLL @ 0x24 (+9) */
 	case UART_DLM_EM: /* DLM @ 0x28 (+9) */
 		writel(value, p->membase + (offset << 2));
+		break;
 	}
 }