Fixed memory leak

Zend/zend_exceptions.c

@@ -52,6 +52,7 @@ void zend_exception_set_previous(zval *add_previous TSRMLS_DC)
 		previous = zend_read_property(default_exception_ce, exception, "previous", sizeof("previous")-1, 1 TSRMLS_CC);
 		if (Z_TYPE_P(previous) == IS_NULL) {
 			zend_update_property(default_exception_ce, exception, "previous", sizeof("previous")-1, add_previous TSRMLS_CC);
+			Z_DELREF_P(add_previous);
 			return;
 		}
 		exception = previous;

ext/spl/tests/iterator_041b.phpt

@@ -101,5 +101,10 @@ State 3: valid()
 State 4: current()
 State 5: key()
 State 6: next()
-
-Fatal error: Ignoring exception from MyArrayIterator::__destruct() while an exception is already active (Uncaught Exception in %s on line %d) in %siterator_041b.php on line %d
+===iterator_count===
+State 0: __construct()
+State 1: __construct()
+State 2: rewind()
+State 3: valid()
+State 6: next()
+===DONE===