Convert anachronistic use of 'void *' to 'DeclContext *' in Scope that was a holdover from the long-dead Action interface.

llvm-svn: 192203
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index 6d357e7..66749c5 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -6934,7 +6934,7 @@
   // If the scope has an associated entity and the using directive is at
   // namespace or translation unit scope, add the UsingDirectiveDecl into
   // its lookup structure so qualified name lookup can find it.
-  DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity());
+  DeclContext *Ctx = S->getEntity();
   if (Ctx && !Ctx->isFunctionOrMethod())
     Ctx->addDecl(UDir);
   else