fix pr comments

Co-authored-by: Congcong Cai <[email protected]>

Author: vbvictor

clang-tools-extra/clang-tidy/misc/UnusedUsingDeclsCheck.cpp

@@ -186,7 +186,7 @@ void UnusedUsingDeclsCheck::check(const MatchFinder::MatchResult &Result) {
   // Check user-defined literals
   if (const auto *UDL = Result.Nodes.getNodeAs<UserDefinedLiteral>("used")) {
     const Decl *CalleeDecl = UDL->getCalleeDecl();
-    if (const auto *FD = dyn_cast<FunctionDecl>(UDL->getCalleeDecl())) {
+    if (const auto *FD = dyn_cast<FunctionDecl>(CalleeDecl)) {
       if (const FunctionTemplateDecl *FPT = FD->getPrimaryTemplate()) {
         removeFromFoundDecls(FPT);
         return;