ASoC: fsi: fixup fsi_pointer() calculation method

current fsi_pointer() calculation was not correct for FSI driver.
This patch fix it up.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index db6c89a..ea4a82d0 100644
--- a/sound/soc/sh/fsi.c
+++ b/sound/soc/sh/fsi.c
@@ -1152,12 +1152,8 @@
 {
 	struct fsi_priv *fsi = fsi_get_priv(substream);
 	struct fsi_stream *io = fsi_get_stream(fsi, fsi_is_play(substream));
-	int samples_pos = io->buff_sample_pos - 1;
 
-	if (samples_pos < 0)
-		samples_pos = 0;
-
-	return fsi_sample2frame(fsi, samples_pos);
+	return fsi_sample2frame(fsi, io->buff_sample_pos);
 }
 
 static struct snd_pcm_ops fsi_pcm_ops = {