Description:
------------
File handles are normally closed automatically when the reference count hits zero.  For example, if you fopen() something in a function and only assign it to a local variable, the file is closed when the function returns.

CURLOPT_INFILE breaks this behavior.  Presumably, the curl resource destructor does not decrement the reference count for the file handle.  

Reproduce code:
---------------
<?
    $name = tempnam("/tmp", "phpbug");
    $n = count(scandir("/proc/self/fd"));

    test_simple($name);
    var_dump(count(scandir("/proc/self/fd")) == $n);

    test_curl($name, true);
    var_dump(count(scandir("/proc/self/fd")) == $n);

    test_curl($name, false);
    var_dump(count(scandir("/proc/self/fd")) == $n);

    function test_simple($name)
    {
        $fp = fopen($name, "r");
    }

    function test_curl($name, $close)
    {
        $fp = fopen($name, "r");
        $c = curl_init();
        curl_setopt($c, CURLOPT_PUT, true);
        curl_setopt($c, CURLOPT_INFILE, $fp);
        curl_setopt($c, CURLOPT_INFILESIZE, 0);
        curl_setopt($c, CURLOPT_RETURNTRANSFER, true);
        curl_exec($c);
        curl_close($c);
        if ($close)
            fclose($fp);
    }
?>


Expected result:
----------------
bool(true)
bool(true)
bool(true)


Actual result:
--------------
bool(true)
bool(true)
bool(false)