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delete a useless variable

Signed-off-by: Yanqiang Miao <miao.yanqiang@zte.com.cn>

Yanqiang Miao authored on 2016/07/29 16:34:21
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@@ -9,7 +9,6 @@ import (
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 )
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 var (
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-	errInvalidScope = errors.New("invalid scope")
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 	errNoSuchVolume = errors.New("no such volume")
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 )
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