atl: Remove dead assignment

[Bruno Jesus]

[dlls\atl\registrar.c:383] -> [dlls\atl\registrar.c:387]:
(performance) Variable 'hres' is reassigned a value before the old one
has been used.
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diff --git a/dlls/atl/registrar.c b/dlls/atl/registrar.c
index 90c5b5b..b0a8b7c 100644
--- a/dlls/atl/registrar.c
+++ b/dlls/atl/registrar.c
@@ -380,7 +380,7 @@ static HRESULT do_process_root_key(LPCOLESTR data, BOOL do_register)
 {
     LPCOLESTR iter = data;
     strbuf buf;
-    HRESULT hres = S_OK;
+    HRESULT hres;
     unsigned int i;
 
     strbuf_init(&buf);