ASoC: wm8940: Fix a typo for the mask of setting WM8940_BCLKDIV

The registers are 16 bits, thus remove an extra F for the mask.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/codecs/wm8940.c b/sound/soc/codecs/wm8940.c
index 3cc3bce..fec3892 100644
--- a/sound/soc/codecs/wm8940.c
+++ b/sound/soc/codecs/wm8940.c
@@ -619,7 +619,7 @@
 
 	switch (div_id) {
 	case WM8940_BCLKDIV:
-		reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFFEF3;
+		reg = snd_soc_read(codec, WM8940_CLOCK) & 0xFEF3;
 		ret = snd_soc_write(codec, WM8940_CLOCK, reg | (div << 2));
 		break;
 	case WM8940_MCLKDIV: