ASoC: sun4i-i2s: Replace call to params_width by local variable

The sun4i_i2s_hw_params function already has a variable holding the value
returned by params_width, so let's just use that variable instead of
calling params_width multiple times.
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://lore.kernel.org/r/f85a1c1e014080a4bbc3abd19bc8fdcb86f0981a.1566392800.git-series.maxime.ripard@bootlin.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sunxi/sun4i-i2s.c

@@ -487,7 +487,7 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream,
 	}
 	i2s->playback_dma_data.addr_width = width;
 
-	sr = i2s->variant->get_sr(i2s, params_width(params));
+	sr = i2s->variant->get_sr(i2s, word_size);
 	if (sr < 0)
 		return -EINVAL;