ASoC: wm8994: Make sure we disable FLL bypass when stopping the FLL

If FLL bypass is left enabled when we disable the CODEC then the output
clock will be left running which consumes a small amount of additional
current. Only enable bypass when there is an output.
Signed-off-by: NKyung-Kwee Ryu <Kyung-Kwee.Ryu@wolfsonmicro.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/codecs/wm8994.c

@@ -1982,7 +1982,7 @@ static int _wm8994_set_fll(struct snd_soc_codec *codec, int id, int src,
 			    WM8994_FLL1_ENA, 0);
 
 	if (wm8994->fll_byp && src == WM8994_FLL_SRC_BCLK &&
-	    freq_in == freq_out) {
+	    freq_in == freq_out && freq_out) {
 		dev_dbg(codec->dev, "Bypassing FLL%d\n", id + 1);
 		snd_soc_update_bits(codec, WM8994_FLL1_CONTROL_5 + reg_offset,
 				    WM8958_FLL1_BYP, WM8958_FLL1_BYP);