wal : wal.Verify defer close the opened WAL files
wal : wal.Verify defer close the opened WAL files

wal.Verify() : The opened WAL files are not closed in error cases. Fixed by adding a
defer.

mkumatag/etcd,mqliang/etcd,mqliang/etcd,coreos/etcd,ajityagaty/etcd,gyuho/etcd,ajityagaty/etcd,dannysauer/etcd,etcd-io/etcd,rnaveiras/etcd,li-ang/etcd,rnaveiras/etcd,li-ang/etcd,mqliang/etcd,etcd-io/etcd,ajityagaty/etcd,dannysauer/etcd,gyuho/etcd,coreos/etcd,etcd-io/etcd,mkumatag/etcd,mkumatag/etcd,rnaveiras/etcd,cockroachdb/etcd,cockroachdb/etcd