Fix Valgrind error in arraySize():

if there's code like: 'int [ ] a = { 1 , 5 , }', 'end' is last '}', when 'tok2' arrives to second ',' and cppcheck finds out that next token to 'tok2' is '}', remove this ',' with 'tok2->deleteThis()' but it causes (maybe) a memory corruption to 'end' which will gave problems later because 'tok' will be assigned to it or its next token.

lib/tokenize.cpp

@@ -2618,8 +2618,10 @@ void Tokenizer::arraySize()
                 } else if (tok2->str() == ",") {
                     if (!Token::Match(tok2->next(), "[},]"))
                         ++sz;
-                    else
-                        tok2->deleteThis();
+                    else {
+                        tok2 = tok2->previous();
+                        tok2->deleteNext();
+                    }
                 }
             }