cam: Validate camera configuration

Use CameraConfiguration::validate() to validate and possibly update the
camera configuration when its prepared.

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

src/cam/main.cpp

@@ -243,6 +243,18 @@ int CamApp::prepareConfig()
 		}
 	}
 
+	switch (config_->validate()) {
+	case CameraConfiguration::Valid:
+		break;
+	case CameraConfiguration::Adjusted:
+		std::cout << "Camera configuration adjusted" << std::endl;
+		break;
+	case CameraConfiguration::Invalid:
+		std::cout << "Camera configuration invalid" << std::endl;
+		config_.reset();
+		return -EINVAL;
+	}
+
 	return 0;
 }