pk: Only clear notifier results when they're successful

Otherwise the information can be useful for the time being.
At least until we get a new successful result.

libdiscover/backends/PackageKitBackend/PackageKitNotifier.cpp

@@ -137,9 +137,8 @@ void PackageKitNotifier::checkOfflineUpdates()
         });
 
         notification->sendEvent();
+        PackageKit::Daemon::global()->offline()->clearResults();
     }
-
-    PackageKit::Daemon::global()->offline()->clearResults();
 }
 
 void PackageKitNotifier::recheckSystemUpdateNeeded()