store/tikv: fix an unlock bug (#1502)
store/tikv: fix an unlock bug (#1502)


wusphinx/tidb,gaocegege/tidb,qhsong/tidb,XuHuaiyu/tidb,c4pt0r/tidb,qiuyesuifeng/tidb,tiancaiamao/tidb,ueizhou/tidb,myrice/tidb,mccxj/tidb,pingcap/tidb,EvilMcJerkface/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb,CodeRushing/tidb,coocood/tidb,ngaut/tidb,kyle-wang/tidb,zimulala/tidb,astaxie/tidb,silentred/tidb,CodeRushing/tidb,kyle-wang/tidb,simon-xia/tidb,mccxj/tidb,c4pt0r/tidb,qiuyesuifeng/tidb,liyu4/tidb,andelf/tidb,Cofyc/tidb,andelf/tidb,Cofyc/tidb,JinheLin/tidb,pingcap/tidb,zimulala/tidb,yangwenmai/tidb,JinheLin/tidb,anywhy/tidb,Nify/tidb,liyu4/tidb,ngaut/tidb,8cbx/tidb,c4pt0r/tidb,kyle-wang/tidb,yuanwhy/tidb,silentred/tidb,silenceper/tidb,ming-relax/tidb,louishust/tidb,yuanwhy/tidb,EvilMcJerkface/tidb,tiancaiamao/tidb,anywhy/tidb,astaxie/tidb,ngaut/tidb,spongedu/tidb,zs634134578/tidb,zs634134578/tidb,ueizhou/tidb,kyle-wang/tidb,XuHuaiyu/tidb,8cbx/tidb,cosmtrek/tidb,silenceper/tidb,wusphinx/tidb,kyle-wang/tidb,pingcap/tidb,ming-relax/tidb,c4pt0r/tidb,pingcap/tidb,coocood/tidb,c4pt0r/tidb,spongedu/tidb,gaocegege/tidb,pingcap/tidb,kyle-wang/tidb,yangwenmai/tidb,cosmtrek/tidb,c4pt0r/tidb,qhsong/tidb,simon-xia/tidb,Nify/tidb,myrice/tidb,ngaut/tidb,louishust/tidb