ASoC: Intel: Skylake: skl-nhlt: remove redundant initialization

Fix cppcheck warning:

sound/soc/intel/skylake/skl-nhlt.c:203:21: style: Variable 'rate' is
assigned a value that is never used. [unreadVariable]
 unsigned long rate = 0;
                    ^
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200813200147.61990-17-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/skylake/skl-nhlt.c

@@ -200,7 +200,7 @@ static void skl_get_ssp_clks(struct skl_dev *skl, struct skl_ssp_clk *ssp_clks,
 	struct skl_ssp_clk *sclk, *sclkfs;
 	struct nhlt_fmt_cfg *fmt_cfg;
 	struct wav_fmt_ext *wav_fmt;
-	unsigned long rate = 0;
+	unsigned long rate;
 	bool present = false;
 	int rate_index = 0;
 	u16 channels, bps;