Check sensor error after trying to read

AdaptiveBrightness/main.cpp

@@ -21,10 +21,10 @@ int main(int argc, char* argv[])
     auto sensors = sensorDriver.enumerateSensors();
 
     for(auto& sensor: sensors) {
-        if(sensor) {
-            const auto sensorRange = sensor.readRange();
-            const auto sensorValues = sensor.readValues();
+        const auto sensorRange = sensor.readRange();
+        const auto sensorValues = sensor.readValues();
 
+        if(sensor) {
             qInfo(ltr("Sensor range: [%1,%2]").arg(sensorRange.first).arg(sensorRange.second));
 
             for(size_t i = 0; i < sensorValues.size(); ++i) {