p54spi: always call p54spi_sleep in p54spi_tx_frame if p54spi_wakeup succeeded

Put chip into sleep state, once it's been awaken.
Also, propagate error code to the caller.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/p54/p54spi.c

@@ -434,16 +434,16 @@ static int p54spi_tx_frame(struct p54s_priv *priv, struct sk_buff *skb)
 	if (!p54spi_wait_bit(priv, SPI_ADRS_HOST_INTERRUPTS,
 			     cpu_to_le32(SPI_HOST_INT_WR_READY))) {
 		dev_err(&priv->spi->dev, "WR_READY timeout\n");
-		ret = -1;
+		ret = -EAGAIN;
 		goto out;
 	}
 
 	p54spi_int_ack(priv, SPI_HOST_INT_WR_READY);
-	p54spi_sleep(priv);
 
 	if (FREE_AFTER_TX(skb))
 		p54_free_skb(priv->hw, skb);
 out:
+	p54spi_sleep(priv);
 	return ret;
 }