Simplify HttpServer_Websockets sample

(Discovered memory leak in `WebsocketConnection::send` - SmingHub#2749)

samples/HttpServer_WebSockets/app/CUserData.cpp

@@ -10,34 +10,24 @@ void CUserData::addSession(WebsocketConnection& connection)
 
 void CUserData::removeSession(WebsocketConnection& connection)
 {
-	int i = activeWebSockets.indexOf(&connection);
-	if(i < 0) {
-		return;
+	if(activeWebSockets.removeElement(&connection)) {
+		connection.setUserData(nullptr);
+		Serial.println(F("Removed user session"));
 	}
-
-	activeWebSockets[i]->setUserData(nullptr);
-	activeWebSockets.remove(i);
-	Serial.println(F("Removed user session"));
 }
 
 void CUserData::printMessage(WebsocketConnection& connection, const String& msg)
 {
-	unsigned i = 0;
-	for(; i < activeWebSockets.count(); i++) {
-		if(connection == *(activeWebSockets[i])) {
-			break;
-		}
-	}
-
-	if(i < activeWebSockets.count()) {
-		Serial << _F("Received msg on connection ") << i << ": " << msg;
+	int i = activeWebSockets.indexOf(&connection);
+	if(i >= 0) {
+		Serial << _F("Received msg on connection ") << i << ": " << msg << endl;
 	}
 }
 
 void CUserData::logOut()
 {
-	for(auto skt : activeWebSockets) {
-		skt->setUserData(nullptr);
+	for(auto socket : activeWebSockets) {
+		socket->setUserData(nullptr);
 	}
 
 	activeWebSockets.removeAllElements();