MAINT: fix the last build warning in `optimize/_trlib/`
MAINT: fix the last build warning in `optimize/_trlib/`

vigna/scipy,andyfaff/scipy,rgommers/scipy,scipy/scipy,zerothi/scipy,zerothi/scipy,ilayn/scipy,e-q/scipy,Eric89GXL/scipy,e-q/scipy,scipy/scipy,mdhaber/scipy,WarrenWeckesser/scipy,zerothi/scipy,endolith/scipy,grlee77/scipy,vigna/scipy,vigna/scipy,endolith/scipy,andyfaff/scipy,e-q/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,Stefan-Endres/scipy,WarrenWeckesser/scipy,zerothi/scipy,Eric89GXL/scipy,ilayn/scipy,WarrenWeckesser/scipy,matthew-brett/scipy,tylerjereddy/scipy,matthew-brett/scipy,Eric89GXL/scipy,mdhaber/scipy,Stefan-Endres/scipy,Stefan-Endres/scipy,e-q/scipy,perimosocordiae/scipy,Eric89GXL/scipy,scipy/scipy,mdhaber/scipy,grlee77/scipy,matthew-brett/scipy,perimosocordiae/scipy,andyfaff/scipy,Eric89GXL/scipy,perimosocordiae/scipy,tylerjereddy/scipy,andyfaff/scipy,ilayn/scipy,anntzer/scipy,endolith/scipy,anntzer/scipy,WarrenWeckesser/scipy,vigna/scipy,ilayn/scipy,anntzer/scipy,mdhaber/scipy,ilayn/scipy,scipy/scipy,Stefan-Endres/scipy,rgommers/scipy,zerothi/scipy,e-q/scipy,vigna/scipy,endolith/scipy,rgommers/scipy,endolith/scipy,tylerjereddy/scipy,tylerjereddy/scipy,Stefan-Endres/scipy,Eric89GXL/scipy,mdhaber/scipy,perimosocordiae/scipy,anntzer/scipy,zerothi/scipy,grlee77/scipy,endolith/scipy,scipy/scipy,mdhaber/scipy,matthew-brett/scipy,andyfaff/scipy,rgommers/scipy,grlee77/scipy,perimosocordiae/scipy,tylerjereddy/scipy,WarrenWeckesser/scipy,matthew-brett/scipy,anntzer/scipy,grlee77/scipy,perimosocordiae/scipy,scipy/scipy,ilayn/scipy,andyfaff/scipy,rgommers/scipy,anntzer/scipy