serial: sh-sci: simplify locking when re-issuing RXDMA fails

Avoid a superfluous unlock/lock-pair by simply moving the printout to
the end of bailing out.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20240506114016.30498-10-wsa+renesas@sang-engineering.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/sh-sci.c

@@ -1360,14 +1360,12 @@ static void sci_dma_rx_complete(void *arg)
 	return;
 
 fail:
-	uart_port_unlock_irqrestore(port, flags);
-	dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n");
 	/* Switch to PIO */
-	uart_port_lock_irqsave(port, &flags);
 	dmaengine_terminate_async(chan);
 	sci_dma_rx_chan_invalidate(s);
 	sci_dma_rx_reenable_irq(s);
 	uart_port_unlock_irqrestore(port, flags);
+	dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n");
 }
 
 static void sci_dma_tx_release(struct sci_port *s)