ASoC: ti: remove comparison to bool in omap_mcbsp_dai_set_dai_fmt()

Fix the following coccicheck warning:

sound/soc/ti/omap-mcbsp.c:1188:5-11: WARNING: Comparison to bool
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Link: https://lore.kernel.org/r/20200426094238.23914-1-yanaijie@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/ti/omap-mcbsp.c

@@ -1185,7 +1185,7 @@ static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 	default:
 		return -EINVAL;
 	}
-	if (inv_fs == true)
+	if (inv_fs)
 		regs->pcr0 ^= FSXP | FSRP;
 
 	return 0;