Set current renderer to NULL in GPU_Quit().
Set current renderer to NULL in GPU_Quit().
ademuri/sdl-gpu,Helios-vmg/sdl-gpu,grimfang4/sdl-gpu,grimfang4/sdl-gpu,ademuri/sdl-gpu,masonwheeler/sdl-gpu,masonwheeler/sdl-gpu,ademuri/sdl-gpu,masonwheeler/sdl-gpu,ademuri/sdl-gpu,Helios-vmg/sdl-gpu,grimfang4/sdl-gpu,grimfang4/sdl-gpu,Helios-vmg/sdl-gpu,masonwheeler/sdl-gpu,Helios-vmg/sdl-gpu