Fix DateInterval->days value

when object was created not from DateTime::diff()

Author: Irker

ext/date/php_date.c

@@ -3470,7 +3470,11 @@ zval *date_interval_read_property(zval *object, zval *member, int type, const ze
 	ALLOC_INIT_ZVAL(retval);
 	Z_SET_REFCOUNT_P(retval, 0);
 
-	ZVAL_LONG(retval, value);
+	if (value != -99999) {
+		ZVAL_LONG(retval, value);
+	} else {
+		ZVAL_FALSE(retval);
+	}
 
 	if (member == &tmp_member) {
 		zval_dtor(member);

ext/date/tests/DateInterval_days_prop1.phpt

@@ -0,0 +1,10 @@
+--TEST--
+Wrong var_dump(DateInterval->days) value
+--FILE--
+<?php
+
+$interval = new DateInterval('P2Y4DT6H8M');;
+
+var_dump($interval->days);
+--EXPECT--
+bool(false)