ASoC: rsnd: drop useles self-assignments

Coverity reported (CID 1397992) this self-assignment. I think the code
stays readable even with the assignments removed.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sh/rcar/core.c

@@ -674,12 +674,10 @@ static int rsnd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 	/* set clock inversion */
 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_IF:
-		rdai->bit_clk_inv =  rdai->bit_clk_inv;
 		rdai->frm_clk_inv = !rdai->frm_clk_inv;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		rdai->bit_clk_inv = !rdai->bit_clk_inv;
-		rdai->frm_clk_inv =  rdai->frm_clk_inv;
 		break;
 	case SND_SOC_DAIFMT_IB_IF:
 		rdai->bit_clk_inv = !rdai->bit_clk_inv;