libcamera: ipu3: Improve error on multiple raw streams request

Improve the error message emitted when multiple raw streams are
requested.

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/ipu3/ipu3.cpp

@@ -341,8 +341,7 @@ CameraConfiguration *PipelineHandlerIPU3::generateConfiguration(Camera *camera,
 		case StreamRole::StillCaptureRaw: {
 			if (streams.find(&data->rawStream_) == streams.end()) {
 				LOG(IPU3, Error)
-					<< "No stream available for requested role "
-					<< role;
+					<< "Multiple raw streams are not supported";
 				break;
 			}