make sure _onenorm_matrix_power_nnm actually returns a float
make sure _onenorm_matrix_power_nnm actually returns a float

Used to be a numpy.array of size 1 up until now.

scipy/scipy,arokem/scipy,andyfaff/scipy,scipy/scipy,WarrenWeckesser/scipy,Eric89GXL/scipy,lhilt/scipy,grlee77/scipy,zerothi/scipy,arokem/scipy,aeklant/scipy,pizzathief/scipy,vigna/scipy,aeklant/scipy,endolith/scipy,person142/scipy,aarchiba/scipy,aarchiba/scipy,andyfaff/scipy,ilayn/scipy,matthew-brett/scipy,tylerjereddy/scipy,e-q/scipy,gfyoung/scipy,rgommers/scipy,pizzathief/scipy,nmayorov/scipy,scipy/scipy,e-q/scipy,matthew-brett/scipy,jor-/scipy,perimosocordiae/scipy,jor-/scipy,aeklant/scipy,lhilt/scipy,matthew-brett/scipy,jamestwebber/scipy,perimosocordiae/scipy,matthew-brett/scipy,tylerjereddy/scipy,aarchiba/scipy,matthew-brett/scipy,gfyoung/scipy,Eric89GXL/scipy,pizzathief/scipy,gfyoung/scipy,Stefan-Endres/scipy,anntzer/scipy,person142/scipy,aarchiba/scipy,grlee77/scipy,perimosocordiae/scipy,ilayn/scipy,scipy/scipy,arokem/scipy,grlee77/scipy,anntzer/scipy,Eric89GXL/scipy,gfyoung/scipy,endolith/scipy,pizzathief/scipy,arokem/scipy,gertingold/scipy,scipy/scipy,perimosocordiae/scipy,rgommers/scipy,jor-/scipy,vigna/scipy,zerothi/scipy,e-q/scipy,tylerjereddy/scipy,gfyoung/scipy,lhilt/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,anntzer/scipy,mdhaber/scipy,Eric89GXL/scipy,nmayorov/scipy,jamestwebber/scipy,rgommers/scipy,aeklant/scipy,tylerjereddy/scipy,zerothi/scipy,vigna/scipy,gertingold/scipy,rgommers/scipy,grlee77/scipy,mdhaber/scipy,person142/scipy,person142/scipy,gertingold/scipy,jor-/scipy,lhilt/scipy,Stefan-Endres/scipy,nmayorov/scipy,nmayorov/scipy,scipy/scipy,jamestwebber/scipy,Eric89GXL/scipy,endolith/scipy,WarrenWeckesser/scipy,anntzer/scipy,person142/scipy,andyfaff/scipy,WarrenWeckesser/scipy,andyfaff/scipy,WarrenWeckesser/scipy,ilayn/scipy,tylerjereddy/scipy,ilayn/scipy,gertingold/scipy,Stefan-Endres/scipy,anntzer/scipy,aeklant/scipy,ilayn/scipy,endolith/scipy,WarrenWeckesser/scipy,aarchiba/scipy,Stefan-Endres/scipy,mdhaber/scipy,nmayorov/scipy,WarrenWeckesser/scipy,endolith/scipy,jor-/scipy,arokem/scipy,anntzer/scipy,Stefan-Endres/scipy,pizzathief/scipy,rgommers/scipy,e-q/scipy,grlee77/scipy,zerothi/scipy,andyfaff/scipy,ilayn/scipy,Eric89GXL/scipy,mdhaber/scipy,gertingold/scipy,vigna/scipy,lhilt/scipy,andyfaff/scipy,jamestwebber/scipy,zerothi/scipy,endolith/scipy,vigna/scipy,jamestwebber/scipy,zerothi/scipy,e-q/scipy,mdhaber/scipy,mdhaber/scipy,perimosocordiae/scipy