data_validator_group: add a method to get the state of the sensor with the provided index

validation/data_validator_group.cpp

@@ -338,3 +338,22 @@ DataValidatorGroup::failover_state()
 
 	return DataValidator::ERROR_FLAG_NO_ERROR;
 }
+
+uint32_t
+DataValidatorGroup::get_sensor_state(unsigned index)
+{
+	DataValidator *next = _first;
+	unsigned i = 0;
+
+	while (next != nullptr) {
+		if (i == index) {
+			return next->state();
+		}
+
+		next = next->sibling();
+		i++;
+	}
+
+	// sensor index not found
+	return UINT32_MAX;
+}