spi: Fix spelling mistake "softwade" -> "software"

There is a spelling mistake in a dev_err message. Fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210317093936.5572-1-colin.king@canonical.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi.c

@@ -679,7 +679,7 @@ struct spi_device *spi_new_device(struct spi_controller *ctlr,
 	if (chip->swnode) {
 		status = device_add_software_node(&proxy->dev, chip->swnode);
 		if (status) {
-			dev_err(&ctlr->dev, "failed to add softwade node to '%s': %d\n",
+			dev_err(&ctlr->dev, "failed to add software node to '%s': %d\n",
 				chip->modalias, status);
 			goto err_dev_put;
 		}