Fixes lock file removal

3rdparty/qtsingleapplication/qtlocalpeer.cpp

@@ -107,6 +107,7 @@ QtLocalPeer::QtLocalPeer(QObject* parent, const QString &appId)
                        + QLatin1Char('/') + socketName
                        + QLatin1String("-lockfile");
     lockFile.setFileName(lockName);
+    lockFileCreated = !lockFile.exists();
     lockFile.open(QIODevice::ReadWrite);
 }
 
@@ -212,5 +213,6 @@ void QtLocalPeer::receiveConnection()
 
 QtLocalPeer::~QtLocalPeer ()
 {
-  lockFile.remove();
+  if (lockFileCreated)
+      lockFile.remove();
 }

3rdparty/qtsingleapplication/qtlocalpeer.h

@@ -81,4 +81,5 @@ protected:
 
 private:
     static const char* ack;
+    bool lockFileCreated;
 };