libcamera: raspberrypi: Check dma heap allocator

Check if the dmaHeap_ allocator is valid at match() time to fail
earlier if its construction failed.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>

src/libcamera/pipeline/raspberrypi/raspberrypi.cpp

@@ -904,6 +904,8 @@ bool PipelineHandlerRPi::match(DeviceEnumerator *enumerator)
 		return false;
 
 	std::unique_ptr<RPiCameraData> data = std::make_unique<RPiCameraData>(this);
+	if (!data->dmaHeap_.isValid())
+		return false;
 
 	/* Locate and open the unicam video streams. */
 	data->unicam_[Unicam::Embedded] = RPiStream("Unicam Embedded", unicam_->getEntityByName("unicam-embedded"));