spi: rspi: Re-do the returning value of qspi_transfer_out_in

To reduce complexity of code, drop "ret" then qspi_transfer_out_in function
should return the value of "qspi_trigger_transfer_out_in" directly.

Signed-off-by: Hiep Cao Minh <[e-mail]>
Acked-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-rspi.c

···
 	if (ret != -EAGAIN)
 		return ret;
 
-	ret = qspi_trigger_transfer_out_in(rspi, xfer->tx_buf,
+	return qspi_trigger_transfer_out_in(rspi, xfer->tx_buf,
 					    xfer->rx_buf, xfer->len);
-	if (ret < 0)
-		return ret;
-
-	return 0;
 }
 
 static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)