Remove lock file if opening the database failed

git-svn-id: https://svn.code.sf.net/p/keepassx/code/trunk@280 b624d157-de02-0410-bad0-e51aec6abb33

src/mainwindow.cpp

@@ -470,6 +470,7 @@ bool KeepassMainWindow::openDatabase(QString filename,bool IsAuto){
 		setStateFileModified(static_cast<Kdb3Database*>(db)->hasPasswordEncodingChanged());
 	}
 	else{
+		QFile::remove(filename+".lock");
 		setStatusBarMsg(StatusBarLoadingFailed);
 		QString error=db->getError();
 		if(error.isEmpty())error=tr("Unknown error while loading database.");