spi: core: Display return code when failing to transfer message

All the other calls to the controller driver display the error
return code. The return code is helpful to understand what went
wrong, so include it when failing to transfer one message.

Signed-off-by: Eddie James <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: Eddie James

drivers/spi/spi.c

@@ -1672,7 +1672,8 @@ static void __spi_pump_messages(struct spi_controller *ctlr, bool in_kthread)
 	ret = ctlr->transfer_one_message(ctlr, msg);
 	if (ret) {
 		dev_err(&ctlr->dev,
-			"failed to transfer one message from queue\n");
+			"failed to transfer one message from queue: %d\n",
+			ret);
 		goto out;
 	}