Fix compiler errors in Perf plugin

src/sensors/perfevent/PerfeventConfigurator.cpp

@@ -160,7 +160,7 @@ bool PerfeventConfigurator::readConfig(std::string cfgPath) {
                     }
 
                     //group which consists of only one sensor
-                    PerfSensorBase* sensor = new PerfSensorBase(val.second.data());
+                    std::shared_ptr<PerfSensorBase> sensor = std::make_shared<PerfSensorBase>(val.second.data());
                     if (readSensorBase(*sensor, val.second)) {
                         group->pushBackSensor(sensor);
 
@@ -171,7 +171,6 @@ bool PerfeventConfigurator::readConfig(std::string cfgPath) {
                         }
                     } else {
                         LOG(warning) << "Template single " << _baseName << " " << val.second.data() << " could not be read! Omitting";
-                        delete sensor;
                         delete group;
                     }
                 } else {
@@ -196,24 +195,28 @@ bool PerfeventConfigurator::readConfig(std::string cfgPath) {
                 PerfSensorGroup group(val.second.data());
                 if (readSensorGroup(group, val.second)) {
                     //group which consists of only one sensor
-                    PerfSensorBase* sensor;
+                    std::shared_ptr<PerfSensorBase> sensor;
                     //perhaps one sensor is already present because it was copied from the template group
                     if (group.getSensors().size() != 0) {
-                        sensor = dynamic_cast<PerfSensorBase*>(group.getSensors()[0]);
-                        sensor->setName(val.second.data());
-                        if (readSensorBase(*sensor, val.second)) {
-                            customizeAndStore(group, val.second);
-                        } else {
-                            LOG(warning) << "Single " << _baseName << " " << val.second.data() << " could not be read! Omitting";
-                        }
+                        sensor = std::dynamic_pointer_cast<PerfSensorBase>(group.getSensors()[0]);
+                        //check if cast was successful (sensor != nullptr)
+                        if (sensor) {
+                          sensor->setName(val.second.data());
+                          if (readSensorBase(*sensor, val.second)) {
+                              customizeAndStore(group, val.second);
+                          } else {
+                              LOG(warning) << "Single " << _baseName << " " << val.second.data() << " could not be read! Omitting";
+                          }
+                       } else {
+                         LOG(warning) << "Single " << _baseName << " " << val.second.data() << " had a type mismatch when casting! Omitting";
+                       }
                     } else {
-                        sensor = new PerfSensorBase(val.second.data());
+                        sensor = std::make_shared<PerfSensorBase>(val.second.data());
                         if (readSensorBase(*sensor, val.second)) {
                             group.pushBackSensor(sensor);
                             customizeAndStore(group, val.second);
                         } else {
                             LOG(warning) << "Single " << _baseName << " " << val.second.data() << " could not be read! Omitting";
-                            delete sensor;
                         }
                     }
                 } else {