fix bug in disk_merge
fix bug in disk_merge

dogeyes/dpark,Mignet/dpark,quxiaolong1504/dpark,ee08b397/dpark,dogeyes/dpark,Mignet/dpark,304471720/dpark,yanheven/dpark,daishaowei/dpark,304471720/dpark,smarthomekit/dpark,smarthomekit/dpark,yhj630520/dpark,windreamer/dpark,veritynoob/dpark,yhj630520/dpark,windreamer/dpark,yanheven/dpark,douban/dpark,junmoa/dpark,304471720/dpark,windreamer/dpark,dogeyes/dpark,yhj630520/dpark,zzl0/dpark,fe11x/dpark,oceanjack/dpark,quxiaolong1504/dpark,douban/dpark,windreamer/dpark,douban/dpark,daishaowei/dpark,veritynoob/dpark,douban/dpark,zzl0/dpark,fe11x/dpark,mageia/dpark,junmoa/dpark,smarthomekit/dpark,veritynoob/dpark,oceanjack/dpark,douban/dpark,mageia/dpark