ASoC: rockchip: i2s: Fix error code when fail to read I2S_CLR

Add the error code '-EBUSY' when fail to read I2S_CLR
in rockchip_snd_rxctrl() and rockchip_snd_txctrl()

Fixes: 44f362c2 ("ASoC: rockchip: i2s: switch BCLK to GPIO")
Signed-off-by: Judy Hsiao <judyhsiao@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Link: https://lore.kernel.org/r/20220701021427.3120549-1-judyhsiao@chromium.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/rockchip/rockchip_i2s.c

@@ -171,6 +171,7 @@ static int rockchip_snd_txctrl(struct rk_i2s_dev *i2s, int on)
 				retry--;
 				if (!retry) {
 					dev_warn(i2s->dev, "fail to clear\n");
+					ret = -EBUSY;
 					break;
 				}
 			}
@@ -232,6 +233,7 @@ static int rockchip_snd_rxctrl(struct rk_i2s_dev *i2s, int on)
 				retry--;
 				if (!retry) {
 					dev_warn(i2s->dev, "fail to clear\n");
+					ret = -EBUSY;
 					break;
 				}
 			}