Initialize storage class even if we got an erroneous mutable

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@60377 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 22048df..65abc36 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -1162,6 +1162,7 @@
       // an error here
       Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember);
       InvalidDecl = true;
+      SC = VarDecl::None;
       break;
     }