msi: Skip rollback custom actions.

dlls/msi/custom.c

@@ -236,7 +236,7 @@ UINT ACTION_CustomAction(MSIPACKAGE *package, LPCWSTR action, UINT script, BOOL
             }
             else if (type & msidbCustomActionTypeRollback)
             {
-                FIXME("Deferring rollback only action... rollbacks not supported yet\n");
+                FIXME("Deferring rollback only action\n");
                 schedule_action(package, ROLLBACK_SCRIPT, deferred);
             }
             else
@@ -274,6 +274,12 @@ UINT ACTION_CustomAction(MSIPACKAGE *package, LPCWSTR action, UINT script, BOOL
 
             msi_free(actiondata);
         }
+        if (type & msidbCustomActionTypeRollback)
+        {
+            FIXME("Rollbacks not supported yet\n");
+            rc = ERROR_SUCCESS;
+            goto end;
+        }
     }
     else if (!check_execution_scheduling_options(package,action,type))
     {