xmpp: hello_bot: add catchall for Event

Masks HTTPUploadedFile which is useless here as we don't call the upload
method.

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

xmpp/examples/hello_bot.rs

@@ -87,6 +87,7 @@ async fn main() -> Result<(), Option<()>> {
                 Event::AvatarRetrieved(jid, path) => {
                     println!("Received avatar for {} in {}.", jid, path);
                 }
+                _ => (),
             }
         }
     }