msxml3: Remove redundant "not NULL" check of the punk arg.
diff --git a/dlls/msxml3/domdoc.c b/dlls/msxml3/domdoc.c
index aae8a34..d72d20b 100644
--- a/dlls/msxml3/domdoc.c
+++ b/dlls/msxml3/domdoc.c
@@ -2177,8 +2177,7 @@
         return S_OK;
     }
 
-    if ( punk )
-        IUnknown_AddRef( punk );
+    IUnknown_AddRef( punk );
 
     if(This->site)
         IUnknown_Release( This->site );