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/include/device_enumerator.h

@@ -8,6 +8,7 @@
 #define __LIBCAMERA_DEVICE_ENUMERATOR_H__
 
 #include <map>
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -34,7 +35,7 @@ private:
 class DeviceEnumerator
 {
 public:
-	static DeviceEnumerator *create();
+	static std::unique_ptr<DeviceEnumerator> create();
 
 	virtual ~DeviceEnumerator();