removing warning

json-api/db/src/messages.rs

@@ -97,7 +97,7 @@ impl Message {
                         "author" => uid,
                         "channel" => cid
                     }).await;
-                    if let Ok(ret) = res {
+                    if let Ok(_) = res {
                         // now save the data to disk
                         match fs::File::create(content_ref).await {
                             Ok(mut file) => {