PM / Domains: Improve warn for multiple states but no governor

It's possible a PM domain defines only one state and it does not need
a governor to work. For such case, a warning actually is not necessary.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/domain.c

@@ -1766,7 +1766,7 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
 		ret = genpd_set_default_power_state(genpd);
 		if (ret)
 			return ret;
-	} else if (!gov) {
+	} else if (!gov && genpd->state_count > 1) {
 		pr_warn("%s : no governor for states\n", genpd->name);
 	}