ASoC: wm8994: Ensure microphone detection state is reset on removal

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index 19e0b20..29e95f93d 100644
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -3842,6 +3842,7 @@
 		snd_soc_jack_report(wm8994->micdet[0].jack, 0,
 				    SND_JACK_MECHANICAL | SND_JACK_HEADSET |
 				    wm8994->btn_mask);
+		wm8994->mic_detecting = true;
 		goto out;
 	}