Seed rand only at one place.

src/main.cpp

@@ -225,6 +225,7 @@ int main(int argc, char *argv[]) {
     return 0;
   }
 
+  srand(time(0));
   Preferences pref;
 #ifndef DISABLE_GUI
   bool no_splash = false;

src/preferences/options_imp.cpp

@@ -40,8 +40,6 @@
 #include <QDesktopServices>
 
 #include <libtorrent/version.hpp>
-#include <time.h>
-#include <stdlib.h>
 
 #include "options_imp.h"
 #include "preferences.h"
@@ -780,9 +778,7 @@ void options_imp::loadOptions() {
   domainNameTxt->setText(pref.getDynDomainName());
   DNSUsernameTxt->setText(pref.getDynDNSUsername());
   DNSPasswordTxt->setText(pref.getDynDNSPassword());
-  // End Web UI
-  // Random stuff
-  srand(time(0));
+  // End Web UI  
 }
 
 // return min & max ports

src/qtlibtorrent/qbtsession.cpp

@@ -35,7 +35,6 @@
 #include <QHostAddress>
 #include <QNetworkAddressEntry>
 #include <QProcess>
-#include <stdlib.h>
 
 #include "smtp.h"
 #include "filesystemwatcher.h"
@@ -290,8 +289,7 @@ void QBtSession::configureSession() {
   const unsigned short new_listenPort = pref.getSessionPort();
   if (pref.useRandomPort()) { // to check if the randomPort checkbox is selected
       if (!m_randomPortEnabled) {
-          m_randomPortEnabled = true;
-          srand(time(0));
+          m_randomPortEnabled = true;          
           const unsigned short randomPort = rand() % USHRT_MAX + 1025;
           setListeningPort(randomPort);
           addConsoleMessage(tr("qBittorrent is bound to port: TCP/%1", "e.g: qBittorrent is bound to port: 6881").arg(QString::number(getListenPort())));