Description:
------------
Hi,

I'm experiencing some "Segmentation Fault" when trying to use forms with hot keys.

Reproduce code:
---------------
newt_init ();
newt_cls ();
newt_get_screen_size (&$rows, &$cols);
newt_open_window ($rows/2-20, $cols/2-10, 54, 20, "Choose");

$form = newt_form ();
newt_form_add_hot_key ($form, NEWT_KEY_ESCAPE);

$list = newt_listbox (2, 1, 13, NEWT_LISTBOX_RETURNEXIT);
foreach (array (
        "Authentication configuration",
        "Firewall configuration",
        "Mouse configuration",
        "Network configuration",
        "Printer configuration",
        "System services") as $l_item)
    newt_listbox_add_entry ($list, $l_item, $l_item);

newt_form_add_component ($form, $list);
newt_refresh ();
newt_form_run ($form, &$res);

newt_pop_window ();
newt_finished ();
newt_form_destroy ($form);


Expected result:
----------------
Run and press "ESC" to quit

Actual result:
--------------
"ESC" quit with a Segmentation Fault

Program received signal SIGSEGV, Segmentation fault.
0x00000000006b7373 in ?? ()
(gdb) where
#0  0x00000000006b7373 in ?? ()
#1  0x000000000069685d in _zval_dtor_func ()
#2  0x000000000068a8dd in _zval_ptr_dtor ()
#3  0x00000000006a38a8 in zend_hash_destroy ()
#4  0x00000000006968af in _zval_dtor_func ()
#5  0x000000000068a8dd in _zval_ptr_dtor ()
#6  0x00000000006a3562 in ?? ()
#7  0x00000000006a37e8 in zend_hash_graceful_reverse_destroy ()
#8  0x000000000068ae8e in ?? ()
#9  0x00000000006975f2 in ?? ()
#10 0x0000000000643235 in php_request_shutdown ()
#11 0x0000000000726ea4 in ?? ()
#12 0x00007ffff52a5c4d in __libc_start_main () from /lib/libc.so.6
#13 0x000000000042c6a9 in _start ()