Golint fix up
Golint fix up

This fix fixes a golint issue.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>

laijs/docker,estesp/docker,konstruktoid/docker-1,jwhonce/docker,x1022as/docker,dccurtis/docker,trebonian/docker,pradipd/moby,djs55/docker,konstruktoid/docker-upstream,rancher/docker,jameszhan/docker,thaJeztah/docker,dims/docker,nawawi/docker,mikebrow/docker,tmp6154/docker,Ramzec/docker,YuPengZTE/docker,ibuildthecloud/docker,allencloud/docker,cpuguy83/docker,cpuguy83/docker,justincormack/docker,noironetworks/docker,konstruktoid/docker-upstream,tonistiigi/docker,moby/moby,jlhawn/docker,moby/moby,cpuguy83/docker,YuPengZTE/docker,allencloud/docker,gnailuy/docker,jthelin/docker,tmp6154/docker,nawawi/docker,rremer/moby,estesp/docker,laijs/moby,dccurtis/docker,noironetworks/docker,flavio/docker,Ramzec/docker,jameszhan/docker,tonistiigi/docker,johnstep/moby-moby,SvenDowideit/docker,bearstech/moby,johnstep/moby-moby,paralin/docker,crosbymichael/docker,vdemeester/docker,laijs/moby,yosifkit/docker,tophj-ibm/docker,crosbymichael/docker,thaJeztah/docker,moul/docker,paralin/docker,ibuildthecloud/docker,moby/moby,gnailuy/docker,tophj-ibm/docker,dims/docker,trebonian/docker,estesp/docker,nawawi/docker,SvenDowideit/docker,Mokolea/docker,thaJeztah/docker,noironetworks/docker,maxamillion/docker,SvenDowideit/docker,kolyshkin/moby,ibuildthecloud/docker,mikebrow/docker,trebonian/docker,jimjag/docker,YuPengZTE/docker,dmcgowan/docker,flavio/docker,justincormack/docker,bearstech/moby,x1022as/docker,jlhawn/docker,djs55/docker,mahak/docker,yosifkit/docker,rancher/docker,Mokolea/docker,scotttlin/docker,pradipd/moby,AkihiroSuda/docker,unclejack/docker,AkihiroSuda/docker,paralin/docker,konstruktoid/docker-upstream,KarthikNayak/docker,mahak/docker,rremer/moby,jimjag/docker,kojiromike/docker,rancher/docker,tophj-ibm/docker,Ramzec/docker,jameszhan/docker,kolyshkin/docker,Ramzec/docker,Mokolea/docker,tonistiigi/docker,scotttlin/docker,AkihiroSuda/docker,kolyshkin/docker,nalind/docker,vdemeester/docker,gnailuy/docker,trebonian/docker,mahak/docker,vdemeester/docker,thaJeztah/docker,cpuguy83/docker,kojiromike/docker,docker/docker,AkihiroSuda/docker,kolyshkin/moby,yosifkit/docker,yongtang/docker,johnstep/moby-moby,jthelin/docker,duglin/docker,jwhonce/docker,jlhawn/docker,nalind/docker,ibuildthecloud/docker,scotttlin/docker,yongtang/docker,kojiromike/docker,allencloud/docker,jvanz/docker,maxamillion/docker,KarthikNayak/docker,docker/docker,jimjag/docker,rremer/moby,jimjag/docker,gnailuy/docker,dmcgowan/docker,kolyshkin/moby,paralin/docker,KarthikNayak/docker,laijs/moby,unclejack/docker,laijs/docker,x1022as/docker,duglin/docker,mikebrow/docker,nalind/docker,ibuildthecloud/docker,laijs/docker,crosbymichael/docker,tophj-ibm/moby,djs55/docker,unclejack/docker,dims/docker,dccurtis/docker,moul/docker,yosifkit/docker,tophj-ibm/moby,konstruktoid/docker-1,Mokolea/docker,dmcgowan/docker,jwhonce/docker,yongtang/docker,mahak/docker,maxamillion/docker,pradipd/moby,konstruktoid/docker-upstream,justincormack/docker,konstruktoid/docker-1,bearstech/moby,duglin/docker,docker/docker,flavio/docker,bearstech/moby,jvanz/docker,moul/docker,tmp6154/docker,jvanz/docker,nalind/docker,nawawi/docker,moul/docker,flavio/docker,moby/moby,tophj-ibm/moby