MAINT: Fix sign-compare warnings in dragon4.c.
MAINT: Fix sign-compare warnings in dragon4.c.

pizzathief/numpy,rgommers/numpy,simongibbons/numpy,pbrod/numpy,ahaldane/numpy,jorisvandenbossche/numpy,mhvk/numpy,mattip/numpy,jakirkham/numpy,pbrod/numpy,numpy/numpy,ahaldane/numpy,mhvk/numpy,endolith/numpy,tynn/numpy,grlee77/numpy,Eric89GXL/numpy,jakirkham/numpy,pbrod/numpy,numpy/numpy,anntzer/numpy,jorisvandenbossche/numpy,jakirkham/numpy,Eric89GXL/numpy,simongibbons/numpy,gfyoung/numpy,tynn/numpy,pizzathief/numpy,charris/numpy,mattip/numpy,gfyoung/numpy,shoyer/numpy,jakirkham/numpy,jorisvandenbossche/numpy,mhvk/numpy,pbrod/numpy,shoyer/numpy,abalkin/numpy,numpy/numpy,pdebuyl/numpy,shoyer/numpy,ahaldane/numpy,rgommers/numpy,simongibbons/numpy,WarrenWeckesser/numpy,shoyer/numpy,pbrod/numpy,tynn/numpy,jakirkham/numpy,abalkin/numpy,rgommers/numpy,ahaldane/numpy,jorisvandenbossche/numpy,WarrenWeckesser/numpy,Eric89GXL/numpy,numpy/numpy,WarrenWeckesser/numpy,pdebuyl/numpy,grlee77/numpy,madphysicist/numpy,abalkin/numpy,seberg/numpy,mattip/numpy,madphysicist/numpy,MSeifert04/numpy,simongibbons/numpy,shoyer/numpy,pdebuyl/numpy,charris/numpy,MSeifert04/numpy,WarrenWeckesser/numpy,endolith/numpy,pizzathief/numpy,madphysicist/numpy,charris/numpy,charris/numpy,rgommers/numpy,WarrenWeckesser/numpy,seberg/numpy,Eric89GXL/numpy,seberg/numpy,anntzer/numpy,madphysicist/numpy,mhvk/numpy,grlee77/numpy,MSeifert04/numpy,MSeifert04/numpy,MSeifert04/numpy,pizzathief/numpy,madphysicist/numpy,mhvk/numpy,jorisvandenbossche/numpy,simongibbons/numpy,anntzer/numpy,endolith/numpy,pdebuyl/numpy,grlee77/numpy,pizzathief/numpy,ahaldane/numpy,gfyoung/numpy,seberg/numpy,anntzer/numpy,grlee77/numpy,mattip/numpy,endolith/numpy