char/serial: serial_ioport_write: Factor out common code

These three lines are common to both FIFO and regular mode. Just factor
them out to outside the if rather than replicate the same lines inside
both if and else.

Cc: qemu-trivial@nongnu.org
Signed-off-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: NAndreas Färber <afaerber@suse.de>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

hw/char/serial.c

@@ -285,15 +285,11 @@ static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val,
                     fifo8_pop(&s->xmit_fifo);
                 }
                 fifo8_push(&s->xmit_fifo, s->thr);
-                s->thr_ipending = 0;
                 s->lsr &= ~UART_LSR_TEMT;
-                s->lsr &= ~UART_LSR_THRE;
-                serial_update_irq(s);
-            } else {
-                s->thr_ipending = 0;
-                s->lsr &= ~UART_LSR_THRE;
-                serial_update_irq(s);
             }
+            s->thr_ipending = 0;
+            s->lsr &= ~UART_LSR_THRE;
+            serial_update_irq(s);
             serial_xmit(NULL, G_IO_OUT, s);
         }
         break;