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Fix variable shadowing causing LayersSize to be reported as 0

Signed-off-by: Cezar Sa Espinola <cezarsa@gmail.com>

Cezar Sa Espinola authored on 2017/09/13 02:08:57
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@@ -99,7 +99,6 @@ func (daemon *Daemon) SystemDiskUsage(ctx context.Context) (*types.DiskUsage, er
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 	for platform := range daemon.stores {
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 		layerRefs := daemon.getLayerRefs(platform)
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 		allLayers := daemon.stores[platform].layerStore.Map()
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-		var allLayersSize int64
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 		for _, l := range allLayers {
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 			select {
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 			case <-ctx.Done():