ALSA: wm8750: it's MONO1, not MONO

Since first commit wm8750 contained output named MONO, but
all routes mentioned MONO1. Correct MONO to be MONO1.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/soc/codecs/wm8750.c

@@ -348,7 +348,7 @@ static const struct snd_soc_dapm_widget wm8750_dapm_widgets[] = {
 	SND_SOC_DAPM_OUTPUT("ROUT1"),
 	SND_SOC_DAPM_OUTPUT("LOUT2"),
 	SND_SOC_DAPM_OUTPUT("ROUT2"),
-	SND_SOC_DAPM_OUTPUT("MONO"),
+	SND_SOC_DAPM_OUTPUT("MONO1"),
 	SND_SOC_DAPM_OUTPUT("OUT3"),
 
 	SND_SOC_DAPM_INPUT("LINPUT1"),