only trim the disk when the new byte limit is greater than zero
only trim the disk when the new byte limit is greater than zero

rewcraig/PINCache,ondev/TMCache,ramoslin02/TMCache,0x73/TMCache,wonderkiln/TMCache,ramoslin02/TMCache,lydonchandra/PINCache,TimorCan/PINCache,Suninus/TMCache,tumblr/TMCache,nguyehuuphuc08/PINCache,yimouleng/TMCache,Guicai-Li/TMCache,Pingco/PINCache,gshaviv/TMCache,quanquan1986/TMCache,normalcoder/PINCache,Quotation/TMCache,gshaviv/TMCache,Yelp/TMCache,klevison/PINCache,libiao88/TMCache,normalcoder/PINCache,jaredsinclair/PINCache,loconsolutions/PINCache,jaredsinclair/PINCache,Yelp/TMCache,ericzhou2008/TMCache,0x73/TMCache,Pingco/PINCache,Suninus/TMCache,nguyehuuphuc08/TMCache,loconsolutions/PINCache,xhacker/PINCache,nguyehuuphuc08/PINCache,jaredsinclair/PINCache,wonderkiln/TMCache,quanquan1986/TMCache,lydonchandra/PINCache,XZwalk/TMCache,TimorCan/PINCache,msdgwzhy6/TMCache,tumblr/TMCache,pinterest/PINCache,ondev/TMCache,paulkite/TMCache,loconsolutions/PINCache,msdgwzhy6/TMCache,rewcraig/PINCache,lydonchandra/PINCache,TimorCan/PINCache,nguyehuuphuc08/PINCache,klevison/PINCache,normalcoder/PINCache,klevison/PINCache,paulkite/TMCache,nguyehuuphuc08/TMCache,yimouleng/TMCache,xhacker/PINCache,XZwalk/TMCache,pinterest/PINCache,prrane/TMCache,pinterest/PINCache,ericzhou2008/TMCache,Guicai-Li/TMCache,pinterest/PINCache,Pingco/PINCache,libiao88/TMCache,prrane/TMCache,xhacker/PINCache,Quotation/TMCache,rewcraig/PINCache