spi: Drop warning from spi_stop_queue()

Both callers of spi_stop_queue() (i.e. spi_destroy_queue() and
spi_controller_suspend()) already emit an error message if
spi_stop_queue() fails. Another warning in this case isn't helpful, so
drop it.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230916161235.1050176-1-u.kleine-koenig@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi.c

@@ -2093,10 +2093,6 @@ static int spi_stop_queue(struct spi_controller *ctlr)
 
 	spin_unlock_irqrestore(&ctlr->queue_lock, flags);
 
-	if (ret) {
-		dev_warn(&ctlr->dev, "could not stop message queue\n");
-		return ret;
-	}
 	return ret;
 }