libcamera: camera_manager: Turn enumerator into a unique_ptr<>

Convey the fact that the CameraManager class owns the DeviceEnumerator
instance it creates by using std::unique_ptr<> to store the pointer.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

src/libcamera/camera_manager.cpp

@@ -73,7 +73,6 @@ CameraManager::~CameraManager()
  */
 int CameraManager::start()
 {
-
 	if (enumerator_)
 		return -ENODEV;
 
@@ -95,7 +94,7 @@ int CameraManager::start()
 		 */
 		while (1) {
 			PipelineHandler *pipe = factory->create();
-			if (!pipe->match(enumerator_)) {
+			if (!pipe->match(enumerator_.get())) {
 				delete pipe;
 				break;
 			}
@@ -130,10 +129,7 @@ void CameraManager::stop()
 
 	pipes_.clear();
 
-	if (enumerator_)
-		delete enumerator_;
-
-	enumerator_ = nullptr;
+	enumerator_.reset(nullptr);
 }
 
 /**