ASoC: tlv320aic32x4: pll: Remove impossible condition in clk_aic32x4_pll_determine_rate()

Smatch warns:

sound/soc/codecs/tlv320aic32x4-clk.c:219 clk_aic32x4_pll_determine_rate() warn: unsigned 'rate' is never less than zero.

Cc: Maxime Ripard <maxime@cerno.tech>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202306101217.08CRVGcK-lkp@intel.com/
Fixes: 25d43ec3 ("ASoC: tlv320aic32x4: pll: Switch to determine_rate")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20230613011201.1166753-1-sboyd@kernel.orgReviewed-by: Maxime Ripard <mripard@kernel.org>

sound/soc/codecs/tlv320aic32x4-clk.c

@@ -208,18 +208,14 @@ static int clk_aic32x4_pll_determine_rate(struct clk_hw *hw,
 					  struct clk_rate_request *req)
 {
 	struct clk_aic32x4_pll_muldiv settings;
-	unsigned long rate;
 	int ret;
 
 	ret = clk_aic32x4_pll_calc_muldiv(&settings, req->rate, req->best_parent_rate);
 	if (ret < 0)
 		return -EINVAL;
 
-	rate = clk_aic32x4_pll_calc_rate(&settings, req->best_parent_rate);
-	if (rate < 0)
-		return rate;
+	req->rate = clk_aic32x4_pll_calc_rate(&settings, req->best_parent_rate);
 
-	req->rate = rate;
 	return 0;
 }