TS-1006: Fix assert failure in ink_freelist_new

This patch fix:
http://ci.apache.org/builders/tserver-trunk-debug/builds/1172/steps/compile_6/logs/stdio

it's due to careless rebasing of reclaimable freelist patchset.

Signed-off-by: Yunkai Zhang <qiushu.zyk@taobao.com>
Signed-off-by: Zhao Yongming <ming.zym@gmail.com>