Fixed #1397 (false positive: Memory leak in while loop)

lib/tokenize.cpp

@@ -2978,6 +2978,8 @@ bool Tokenizer::simplifyTokenList()
     simplifyNestedStrcat();
     simplifyWhile0();
 
+    simplifyIfAssign();    // could be affected by simplifyIfNot
+
     for (Token *tok = _tokens; tok; tok = tok->next())
     {
         if (Token::Match(tok, "case %any% : %var%"))

test/testsimplifytokens.cpp

@@ -1700,6 +1700,8 @@ private:
                       tok("struct hfs_bnode *node;"
                           "struct hfs_btree *tree;"
                           "while ((node = tree->node_hash[i++])) { }"));
+        ASSERT_EQUALS("char * s ; s = new char [ 10 ] ; while ( ! s ) { s = new char [ 10 ] ; }",
+                      tok("char *s; while (0 == (s=new char[10])) { }"));
     }