[clangd] Add a missing early return in getTypeHierarchy()

Reviewers: sammccall

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, kadircet, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D64307

llvm-svn: 365849

clang-tools-extra/clangd/XRefs.cpp

@@ -1230,6 +1230,8 @@ getTypeHierarchy(ParsedAST &AST, Position Pos, int ResolveLevels,
   RecursionProtectionSet RPSet;
   Optional<TypeHierarchyItem> Result =
       getTypeAncestors(*CXXRD, AST.getASTContext(), RPSet);
+  if (!Result)
+    return Result;
 
   if ((Direction == TypeHierarchyDirection::Children ||
        Direction == TypeHierarchyDirection::Both) &&