ole32: Return an error in CoMarshalInterface if pStream is NULL.

[Robert Shearman]

---
  dlls/ole32/marshal.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)
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diff --git a/dlls/ole32/marshal.c b/dlls/ole32/marshal.c
index 01368cb..4294cb5 100644
--- a/dlls/ole32/marshal.c
+++ b/dlls/ole32/marshal.c
@@ -1550,7 +1550,7 @@ HRESULT WINAPI CoMarshalInterface(IStrea
     dump_MSHLFLAGS(mshlFlags);
     TRACE(")\n");
 
-    if (pUnk == NULL)
+    if (!pUnk || !pStream)
         return E_INVALIDARG;
 
     objref.signature = OBJREF_SIGNATURE;