Description:
------------
RecursiveIteratorIterator returns one extra result if we don't provide rewind() before while.

Reproduce code:
---------------
$array = array( 
    array('name'=>'butch', 'sex'=>'male'), 
    array('name'=>'fido', 'sex'=>'male'), 
    array('name'=>'girly','sex'=>'female') 
);

$it=new RecursiveIteratorIterator(new RecursiveArrayIterator($array)); 

//$it->rewind(); //The result will be as expected if uncomment this
while($it->valid()){ 
  echo $it->key().' -- '.$it->current()."\n"; 
  $it->next(); 
}

Expected result:
----------------
name -- butch
sex -- male
name -- fido
sex -- male
name -- girly
sex -- female

Actual result:
--------------
0 -- Array
name -- butch
sex -- male
name -- fido
sex -- male
name -- girly
sex -- female