clk: tegra: Do not print errors for clk_round_rate()

clk_round_rate() can be used by drivers to determine whether or not a
frequency is supported by the clock. The current Tegra clock driver
outputs an error message and a stacktrace when the requested rate isn't
supported. That's fine for clk_set_rate(), but it's confusing when all
the driver does is query whether or not a frequency is supported.
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/clk/tegra/clk-pll.c

@@ -435,9 +435,6 @@ static int _calc_rate(struct clk_hw *hw, struct tegra_clk_pll_freq_table *cfg,
 	if (cfg->m > divm_max(pll) || cfg->n > divn_max(pll) ||
 	    (1 << p_div) > divp_max(pll)
 	    || cfg->output_rate > pll->params->vco_max) {
-		pr_err("%s: Failed to set %s rate %lu\n",
-		       __func__, __clk_get_name(hw->clk), rate);
-		WARN_ON(1);
 		return -EINVAL;
 	}
 
@@ -584,6 +581,8 @@ static int clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 
 	if (_get_table_rate(hw, &cfg, rate, parent_rate) &&
 	    _calc_rate(hw, &cfg, rate, parent_rate)) {
+		pr_err("%s: Failed to set %s rate %lu\n", __func__,
+		       __clk_get_name(hw->clk), rate);
 		WARN_ON(1);
 		return -EINVAL;
 	}
@@ -615,10 +614,8 @@ static long clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 		return __clk_get_rate(hw->clk);
 
 	if (_get_table_rate(hw, &cfg, rate, *prate) &&
-	    _calc_rate(hw, &cfg, rate, *prate)) {
-		WARN_ON(1);
+	    _calc_rate(hw, &cfg, rate, *prate))
 		return -EINVAL;
-	}
 
 	return cfg.output_rate;
 }