spi: core: Do not mangle error code from kthread_run()

kthread_run() could return ERR_PTR(-EINTR) from kthread_create_on_node().
Return the actual error code in spi_init_queue() instead of mangling it to
-ENOMEM.
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi.c

@@ -1001,7 +1001,7 @@ static int spi_init_queue(struct spi_master *master)
 					   dev_name(&master->dev));
 	if (IS_ERR(master->kworker_task)) {
 		dev_err(&master->dev, "failed to create message pump task\n");
-		return -ENOMEM;
+		return PTR_ERR(master->kworker_task);
 	}
 	init_kthread_work(&master->pump_messages, spi_pump_messages);