tdf#22919 crash on insert picture from the gallery

regression from commit
    commit 1b7bcaa7
    use unique_ptr in svx

Change-Id: Ie3ced1f13ae3d35205174a02d6cbc2c19a171871
Reviewed-on: https://gerrit.libreoffice.org/67498
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

svx/source/gallery2/galbrws2.cxx

@@ -1081,9 +1081,9 @@ void GalleryBrowser2::DispatchAdd(
     pInfo->Arguments = aArgs;
     pInfo->Dispatch = xDispatch;
 
-    if ( !Application::PostUserEvent(
+    if ( Application::PostUserEvent(
             LINK( nullptr, GalleryBrowser2, AsyncDispatch_Impl), pInfo.get() ) )
-        pInfo.reset();
+        pInfo.release();
 }
 
 void GalleryBrowser2::Execute(const OString &rIdent)