The memory is  used after released ??

Hi all,
This is Qianxin CodeSafe Team, we found a suspicious issue, at
https://github.com/google/leveldb/blob/23e35d792b9154f922b8b575b12596a4d8664c65/util/cache.cc#L316
Element "e" is used at
https://github.com/google/leveldb/blob/23e35d792b9154f922b8b575b12596a4d8664c65/util/cache.cc#L314
however，function “Unref” is defined at 
https://github.com/google/leveldb/blob/23e35d792b9154f922b8b575b12596a4d8664c65/util/cache.cc#L226
where has freed e's memory 

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The memory is used after released ?? #1211

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