Fix comparison between signed/unsigned warning for real
Fix comparison between signed/unsigned warning for real

jasperla/i3status,ixjlyons/i3status,jasperla/i3status,Watcom/i3status,peder2tm/i3status-netdev,bsdjhb/i3status,Gravemind/i3status,Gravemind/i3status,Dettorer/i3status,bsdjhb/i3status,peder2tm/i3status-netdev,jasperla/i3status,Gravemind/i3status,flammi/i3status,i3/i3status,i3/i3status,Watcom/i3status,lbonn/i3status,i3/i3status,peder2tm/i3status-netdev,ixjlyons/i3status,peder2tm/i3status-netdev,lexszero/i3status,lexszero/i3status,jasperla/i3status,Gravemind/i3status,lexszero/i3status,flammi/i3status,lbonn/i3status,flammi/i3status,ixjlyons/i3status,Watcom/i3status,ixjlyons/i3status,lbonn/i3status,i3/i3status,lbonn/i3status,Dettorer/i3status,bsdjhb/i3status,Dettorer/i3status,lexszero/i3status,bsdjhb/i3status,Dettorer/i3status,Watcom/i3status,flammi/i3status