maybe fix #14126 squash maybe

Author: ludviggunne

lib/tokenize.cpp

@@ -9542,14 +9542,14 @@ void Tokenizer::simplifyCPPAttribute()
                 Token* head = skipCPPOrAlignAttribute(tok)->next();
                 while (isCPPAttribute(head) || isAlignAttribute(head))
                     head = skipCPPOrAlignAttribute(head)->next();
-                while (Token::Match(head->next(), "%name%|*|&|&&|const|static|inline|volatile"))
+                while (head && Token::Match(head->next(), "%name%|*|&|&&|const|static|inline|volatile"))
                     head = head->next();
                 if (Token::Match(head, "%name%") && !Token::Match(head, "auto ["))
                     head->isAttributeMaybeUnused(true);
                 else if (Token::Match(tok->previous(), "%name%") && Token::Match(tok->link(), "] [;={]")) {
                     tok->previous()->isAttributeMaybeUnused(true);
                 } else {
-                    if (Token::simpleMatch(head->next(), "[")) {
+                    if (head && Token::simpleMatch(head->next(), "[")) {
                         head = head->next();
                         const Token *end = head->link();
                         for (head = head->next(); end && head != end; head = head->next()) {