ASoC: fsl_sai: Use better variable names

"ret" is normally used as a variable name for return values. In
fsl_sai_set_bclk() it stores the difference between the desired rate and
the rate we can archieve, so rename it to "diff". Also rename "savesub"
to "bestdiff" as that stores the best difference we have found.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20220302083428.3804687-6-s.hauer@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/fsl_sai.c

@@ -343,11 +343,10 @@ static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
 	struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai);
 	unsigned int reg, ofs = sai->soc_data->reg_offset;
 	unsigned long clk_rate;
-	u32 savediv = 0, ratio, savesub = freq;
+	u32 savediv = 0, ratio, bestdiff = freq;
 	int adir = tx ? RX : TX;
 	int dir = tx ? TX : RX;
 	u32 id;
-	int ret = 0;
 
 	/* Don't apply to consumer mode */
 	if (sai->is_consumer_mode)
@@ -361,19 +360,21 @@ static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
 	id = sai->soc_data->mclk0_is_mclk1 ? 1 : 0;
 
 	for (; id < FSL_SAI_MCLK_MAX; id++) {
+		int diff;
+
 		clk_rate = clk_get_rate(sai->mclk_clk[id]);
 		if (!clk_rate)
 			continue;
 
 		ratio = clk_rate / freq;
 
-		ret = clk_rate - ratio * freq;
+		diff = clk_rate - ratio * freq;
 
 		/*
 		 * Drop the source that can not be
 		 * divided into the required rate.
 		 */
-		if (ret != 0 && clk_rate / ret < 1000)
+		if (diff != 0 && clk_rate / diff < 1000)
 			continue;
 
 		dev_dbg(dai->dev,
@@ -385,13 +386,13 @@ static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
 		else
 			continue;
 
-		if (ret < savesub) {
+		if (diff < bestdiff) {
 			savediv = ratio;
 			sai->mclk_id[tx] = id;
-			savesub = ret;
+			bestdiff = diff;
 		}
 
-		if (ret == 0)
+		if (diff == 0)
 			break;
 	}
 
@@ -402,7 +403,7 @@ static int fsl_sai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
 	}
 
 	dev_dbg(dai->dev, "best fit: clock id=%d, div=%d, deviation =%d\n",
-			sai->mclk_id[tx], savediv, savesub);
+			sai->mclk_id[tx], savediv, bestdiff);
 
 	/*
 	 * 1) For Asynchronous mode, we must set RCR2 register for capture, and