carbon: fix lint issues
carbon: fix lint issues

iksaif/biggraphite,dpanth3r/biggraphite,criteo/biggraphite,Thib17/biggraphite,Thib17/biggraphite,Thib17/biggraphite,criteo/biggraphite,iksaif/biggraphite,Thib17/biggraphite,criteo/biggraphite,iksaif/biggraphite,criteo/biggraphite,iksaif/biggraphite