libcamera: raspberrypi: Fail on unsupported stream role

When an unsupported stream roles is requested to
generateConfiguration(), the function shall fail instead of simply
ignoring the request.

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

src/libcamera/pipeline/raspberrypi/raspberrypi.cpp

@@ -568,7 +568,8 @@ CameraConfiguration *PipelineHandlerRPi::generateConfiguration(Camera *camera,
 		default:
 			LOG(RPI, Error) << "Requested stream role not supported: "
 					<< role;
-			break;
+			delete config;
+			return nullptr;
 		}
 
 		if (rawCount > 1 || outCount > 2) {