[codereview]:no close file

[woodliu]

etcd/server/storage/wal/wal.go

Line 703 in ea24fb8

// close old wal file; truncate to avoid wasting space if an early cut

As the comment hint , cut will close the current file before create a new encoder. But i see no where close the current file, may be there is a file leak?

[stale]

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