ASoC: zx: fix simple_return.cocci warnings

sound/soc/zte/zx296702-spdif.c:191:1-4: WARNING: end returns can be simpified

 Simplify a trivial if-return sequence.  Possibly combine with a
 preceding function call.
Generated by: scripts/coccinelle/misc/simple_return.cocci
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/zte/zx296702-spdif.c

@@ -188,11 +188,7 @@ static int zx_spdif_hw_params(struct snd_pcm_substream *substream,
 	ret = zx_spdif_chanstats(zx_spdif->reg_base, rate);
 	if (ret)
 		return ret;
-	ret = clk_set_rate(spdif->dai_clk, rate * ch_num * ZX_SPDIF_CLK_RAT);
-	if (ret)
-		return ret;
-
-	return 0;
+	return clk_set_rate(spdif->dai_clk, rate * ch_num * ZX_SPDIF_CLK_RAT);
 }
 
 static void zx_spdif_cfg_tx(void __iomem *base, int on)