[clang-tidy] Fix bugprone-unchecked-optional-access in FormatStringConverter

Author: zeyi2

clang-tools-extra/clang-tidy/utils/FormatStringConverter.cpp

@@ -800,9 +800,11 @@ void FormatStringConverter::applyFixes(DiagnosticBuilder &Diag,
   }
 
   for (const auto &[ArgIndex, Replacement] : ArgFixes) {
-    const SourceLocation AfterOtherSide =
-        Lexer::findNextToken(Args[ArgIndex]->getEndLoc(), SM, LangOpts)
-            ->getLocation();
+    const auto NextToken =
+        Lexer::findNextToken(Args[ArgIndex]->getEndLoc(), SM, LangOpts);
+    if (!NextToken)
+      continue;
+    const SourceLocation AfterOtherSide = NextToken->getLocation();
 
     Diag << FixItHint::CreateInsertion(Args[ArgIndex]->getBeginLoc(),
                                        Replacement, true)