Fix wrong type

Author: jpienaar

clang-tools-extra/clang-tidy/llvm/MLIROpBuilderCheck.cpp

@@ -31,7 +31,7 @@ class TypeAsWrittenStencil : public StencilInterface {
 
   llvm::Error eval(const MatchFinder::MatchResult &match,
                    std::string *result) const override {
-    RangeSelector n = node(id)(match);
+    llvm::Expected<CharSourceRange> n = node(id)(match);
     if (!n)
       return n.takeError();
     SourceRange srcRange = n->getAsRange();