Use QCoreApplication::exit instead of exit to ensure a clean exit in case of errors.

apm.cpp

@@ -106,7 +106,7 @@ void OperationManager::statusChanged(Akabei::Backend::Status status)
             QTextStream err(stderr);
             err << Akabei::errorPrefix << QObject::tr("The backend seems to be in a broken state. ");
             err << endl;
-            exit(1);
+            QCoreApplication::exit(1);
         }
         default:
             break;