Suppress 'unused' warning in XMPPTCPConnection

smack-tcp/src/main/java/org/jivesoftware/smack/tcp/XMPPTCPConnection.java

@@ -483,6 +483,7 @@ public class XMPPTCPConnection extends AbstractXMPPConnection {
             // After we send the closing stream element, check if there was already a
             // closing stream element sent by the server or wait with a timeout for a
             // closing stream element to be received from the server.
+            @SuppressWarnings("unused")
             Exception res = closingStreamReceived.checkIfSuccessOrWait();
         } catch (InterruptedException | NoResponseException e) {
             LOGGER.log(Level.INFO, "Exception while waiting for closing stream element from the server " + this, e);