[PATCH] ASoC: SOF: Fix randbuild error

[YueHaibing]

When LEDS_TRIGGER_AUDIO is m and SND_SOC_SOF is y,

sound/soc/sof/control.o: In function `snd_sof_switch_put':
control.c:(.text+0x587): undefined reference to `ledtrig_audio_set'
control.c:(.text+0x593): undefined reference to `ledtrig_audio_set'

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: 5d43001ae436 ("ASoC: SOF: acpi led support for switch controls")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20191014091308.23688-1-yuehaibing@xxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
 sound/soc/sof/control.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/sof/control.c b/sound/soc/sof/control.c
index 41551e8f6ac3..2c4abd406c4f 100644
--- a/sound/soc/sof/control.c
+++ b/sound/soc/sof/control.c
@@ -36,10 +36,12 @@ static void update_mute_led(struct snd_sof_control *scontrol,
 
 	scontrol->led_ctl.led_value = temp;
 
+#if IS_REACHABLE(CONFIG_LEDS_TRIGGER_AUDIO)
 	if (!scontrol->led_ctl.direction)
 		ledtrig_audio_set(LED_AUDIO_MUTE, temp ? LED_OFF : LED_ON);
 	else
 		ledtrig_audio_set(LED_AUDIO_MICMUTE, temp ? LED_OFF : LED_ON);
+#endif
 }
 
 static inline u32 mixer_to_ipc(unsigned int value, u32 *volume_map, int size)
-- 
2.20.1