Fix #13705 fuzzing crash (null-pointer-use) in getEnumType() (#8103)

Co-authored-by: chrchr-github <noreply@github.com>

Author: chrchr-github

lib/tokenize.cpp

@@ -8955,6 +8955,8 @@ void Tokenizer::findGarbageCode() const
         if (Token::Match(tok, "!|~ %comp%") &&
             !(cpp && tok->strAt(1) == ">" && Token::simpleMatch(tok->tokAt(-1), "operator")))
             syntaxError(tok);
+        if (Token::Match(tok, "%comp% {") && (!cpp || tok->str() != ">"))
+            syntaxError(tok);
         if (Token::Match(tok, "] %name%") && (!cpp || !(tok->tokAt(1)->isKeyword() || (tok->tokAt(-1) && Token::simpleMatch(tok->tokAt(-2), "delete ["))))) {
             if (tok->next()->isUpperCaseName())
                 unknownMacroError(tok->next());

test/cli/fuzz-crash/crash-cd91802f0554ab425b82191389c9db2be0d50040

@@ -0,0 +1 @@
+{f F<{enum{E=1};}>}