OPP: Fix an un-initialized variable usage

smatch complains that 'ret' may be returned un-initialized.

Explicitly return 0 if we reach the end of the function (should
'opp_table->clk_count' be 0).

Fixes: 8174a3a613af ("OPP: Provide a simple implementation to configure multiple clocks")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/opp/core.c

@@ -873,7 +873,7 @@ int dev_pm_opp_config_clks_simple(struct device *dev,
 		}
 	}
 
-	return ret;
+	return 0;
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_config_clks_simple);