Fix #14883 fuzzing crash (null-pointer-use) in Tokenizer::findGarbageCode() (cppcheck-opensource#8692)

Author: chrchr-github

lib/tokenize.cpp

@@ -8962,6 +8962,8 @@ void Tokenizer::findGarbageCode() const
         const Token* const endTok = tok->linkAt(1);
         for (tok = tok->tokAt(2); tok != endTok; tok = tok->next()) {
             if (const Token* lam = findLambdaEndTokenWithoutAST(tok)) {
+                if (lam == endTok)
+                    break;
                 tok = lam;
                 continue;
             }

test/cli/fuzz-crash/crash-17be2b85446aeb0c7722bedfad4b0e4af27fae3d

@@ -0,0 +1 @@
+{for([]{});}