Remove superfluous initializer. 
The following fully-covered switch either sets value to External or exits the function.

llvm-svn: 295839
diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index 7416894..103c7e1 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -8810,7 +8810,7 @@
   if (!FD->isExternallyVisible())
     return GVA_Internal;
 
-  GVALinkage External = GVA_StrongExternal;
+  GVALinkage External;
   switch (FD->getTemplateSpecializationKind()) {
   case TSK_Undeclared:
   case TSK_ExplicitSpecialization: