[3/5] taskschd: QueryInterface should return NULL interface on error.

[Dmitry Timoshkov]

---
 dlls/taskschd/folder.c            | 1 +
 dlls/taskschd/folder_collection.c | 2 ++
 dlls/taskschd/task.c              | 1 +
 3 files changed, 4 insertions(+)

diff --git a/dlls/taskschd/folder.c b/dlls/taskschd/folder.c
index 0618c23..fd516d6 100644
--- a/dlls/taskschd/folder.c
+++ b/dlls/taskschd/folder.c
@@ -83,6 +83,7 @@ static HRESULT WINAPI TaskFolder_QueryInterface(ITaskFolder *iface, REFIID riid,
     }
 
     FIXME("interface %s is not implemented\n", debugstr_guid(riid));
+    *obj = NULL;
     return E_NOINTERFACE;
 }
 
diff --git a/dlls/taskschd/folder_collection.c b/dlls/taskschd/folder_collection.c
index 1b8c39d..004a977 100644
--- a/dlls/taskschd/folder_collection.c
+++ b/dlls/taskschd/folder_collection.c
@@ -97,6 +97,7 @@ static HRESULT WINAPI folders_QueryInterface(ITaskFolderCollection *iface, REFII
     }
 
     FIXME("interface %s is not implemented\n", debugstr_guid(riid));
+    *obj = NULL;
     return E_NOINTERFACE;
 }
 
@@ -354,6 +355,7 @@ static HRESULT WINAPI enumvar_QueryInterface(IEnumVARIANT *iface, REFIID riid, v
     }
 
     FIXME("interface %s is not implemented\n", debugstr_guid(riid));
+    *obj = NULL;
     return E_NOINTERFACE;
 }
 
diff --git a/dlls/taskschd/task.c b/dlls/taskschd/task.c
index 09fe32a..97bb5f8 100644
--- a/dlls/taskschd/task.c
+++ b/dlls/taskschd/task.c
@@ -81,6 +81,7 @@ static HRESULT WINAPI TaskService_QueryInterface(ITaskService *iface, REFIID rii
     }
 
     FIXME("interface %s is not implemented\n", debugstr_guid(riid));
+    *obj = NULL;
     return E_NOINTERFACE;
 }
 
-- 
1.8.5.3