ASoC: rockchip: i2s: remove unused variables

The previous commit removed the only use of these variables.
Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/rockchip/rockchip_i2s.c

@@ -34,13 +34,6 @@ struct rk_i2s_dev {
 
 	struct regmap *regmap;
 
-/*
- * Used to indicate the tx/rx status.
- * I2S controller hopes to start the tx and rx together,
- * also to stop them when they are both try to stop.
-*/
-	bool tx_start;
-	bool rx_start;
 	bool is_master_mode;
 };
 
@@ -84,11 +77,7 @@ static void rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
 		regmap_update_bits(i2s->regmap, I2S_XFER,
 				   I2S_XFER_TXS_START,
 				   I2S_XFER_TXS_START);
-
-		i2s->tx_start = true;
 	} else {
-		i2s->tx_start = false;
-
 		regmap_update_bits(i2s->regmap, I2S_DMACR,
 				   I2S_DMACR_TDE_ENABLE, I2S_DMACR_TDE_DISABLE);
 
@@ -126,11 +115,7 @@ static void rockchip_snd_rxctrl(struct rk_i2s_dev *i2s, int on)
 		regmap_update_bits(i2s->regmap, I2S_XFER,
 				   I2S_XFER_RXS_START,
 				   I2S_XFER_RXS_START);
-
-		i2s->rx_start = true;
 	} else {
-		i2s->rx_start = false;
-
 		regmap_update_bits(i2s->regmap, I2S_DMACR,
 				   I2S_DMACR_RDE_ENABLE, I2S_DMACR_RDE_DISABLE);