actually return stream from swift

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/private/Files/ObjectStore/Swift.php

@@ -265,7 +265,7 @@ class Swift implements IObjectStore {
 		// save the object content in the context of the stream to prevent it being gc'd until the stream is closed
 		stream_context_set_option($stream, 'swift', 'content', $objectContent);
 
-		RetryWrapper::wrap($stream);
+		return RetryWrapper::wrap($stream);
 	}
 
 	/**