OPP: Return error on error from dev_pm_opp_get_opp_count()

Return error number instead of 0 on failures.

Fixes: a1e8c13600bf ("PM / OPP: "opp-hz" is optional for power domains")
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/opp/core.c

@@ -318,7 +318,7 @@ int dev_pm_opp_get_opp_count(struct device *dev)
 		count = PTR_ERR(opp_table);
 		dev_dbg(dev, "%s: OPP table not found (%d)\n",
 			__func__, count);
-		return 0;
+		return count;
 	}
 
 	count = _get_opp_count(opp_table);