apps: lc-compliance: Initialize CameraManager pointer in Environment

Do not leave it unitialized.

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

src/apps/lc-compliance/environment.h

@@ -23,5 +23,5 @@ private:
 	Environment() = default;
 
 	std::string cameraId_;
-	libcamera::CameraManager *cm_;
+	libcamera::CameraManager *cm_ = nullptr;
 };