cpuidle: dt: Clarify a comment and simplify code in dt_init_idle_driver()

The drv->state_count is assigned the total number of available states, so
let's make that clear.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpuidle/dt_idle_states.c

@@ -211,11 +211,8 @@ int dt_init_idle_driver(struct cpuidle_driver *drv,
 	of_node_put(cpu_node);
 	if (err)
 		return err;
-	/*
-	 * Update the driver state count only if some valid DT idle states
-	 * were detected
-	 */
-	if (i)
+
+	/* Set the number of total supported idle states. */
 	drv->state_count = state_idx;
 
 	/*