msxml3: Remove redundant "not NULL" check of the punk arg.

[Michael Stefaniuc]

It is known to be non-NULL in the affected code path. Found by
coccicheck.
---
 dlls/msxml3/domdoc.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

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 @@ xmldoc_SetSite( IObjectWithSite *iface, IUnknown *punk )
         return S_OK;
     }
 
-    if ( punk )
-        IUnknown_AddRef( punk );
+    IUnknown_AddRef( punk );
 
     if(This->site)
         IUnknown_Release( This->site );
-- 
1.7.1