Remove unnecessary array copy in pixel_scale_matrix
Remove unnecessary array copy in pixel_scale_matrix

mhvk/astropy,larrybradley/astropy,dhomeier/astropy,larrybradley/astropy,StuartLittlefair/astropy,astropy/astropy,mhvk/astropy,mhvk/astropy,saimn/astropy,pllim/astropy,aleksandr-bakanov/astropy,mhvk/astropy,StuartLittlefair/astropy,astropy/astropy,pllim/astropy,lpsinger/astropy,dhomeier/astropy,saimn/astropy,lpsinger/astropy,StuartLittlefair/astropy,dhomeier/astropy,dhomeier/astropy,astropy/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,larrybradley/astropy,pllim/astropy,larrybradley/astropy,saimn/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,mhvk/astropy,aleksandr-bakanov/astropy,astropy/astropy,dhomeier/astropy,astropy/astropy,larrybradley/astropy,pllim/astropy,saimn/astropy,pllim/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,saimn/astropy,lpsinger/astropy