Delete operation performs the store.delete twice

[jarifibrahim]

When an item is deleted by cache.Del(key), we delete it from the store on the following line
https://github.com/dgraph-io/ristretto/blob/a093fe661329ba68a99a9c3a63674992355f40b1/cache.go#L248-L259

the same item is deleted again in the process() goroutine
https://github.com/dgraph-io/ristretto/blob/a093fe661329ba68a99a9c3a63674992355f40b1/cache.go#L331-L334

I don't think there's a major side-effect of doing this but we're doing unnecessary work by deleting an already deleted key.

[minhaj-shakeel]

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