Fix unused variable warning in SemaTemplate. NFC

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@321346 91177308-0d34-0410-b5e6-96231b3b80d8

Author: sam-mccall

lib/Sema/SemaTemplate.cpp

@@ -950,7 +950,7 @@ Decl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D,
     if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified)
       EmitDiag(DS.getStorageClassSpecLoc());
 
-    if (DeclSpec::TSCS TSCS = DS.getThreadStorageClassSpec())
+    if (DS.getThreadStorageClassSpec() != TSCS_unspecified)
       EmitDiag(DS.getThreadStorageClassSpecLoc());
 
     // [dcl.inline]p1: