Replace the zeroing of pointers with nullptr

src/base/bittorrent/session.cpp

@@ -1005,7 +1005,7 @@ void Session::freeInstance()
 {
     if (m_instance) {
         delete m_instance;
-        m_instance = 0;
+        m_instance = nullptr;
     }
 }
 

src/base/bittorrent/session.h

@@ -562,7 +562,7 @@ namespace BitTorrent
             bool requestedFileDeletion;
         };
 
-        explicit Session(QObject *parent = 0);
+        explicit Session(QObject *parent = nullptr);
         ~Session();
 
         bool hasPerTorrentRatioLimit() const;

src/base/bittorrent/torrenthandle.cpp

@@ -1639,7 +1639,7 @@ void TorrentHandle::handleSaveResumeDataFailedAlert(libtorrent::save_resume_data
     // if torrent has no metadata we should save dummy fastresume data
     // containing Magnet URI and qBittorrent own resume data only
     if (p->error.value() == libt::errors::no_metadata)
-        handleSaveResumeDataAlert(0);
+        handleSaveResumeDataAlert(nullptr);
     else
         m_session->handleTorrentResumeDataFailed(this);
 }