Fix batch drawing when batch count greater than allocated vertices.
Fix batch drawing when batch count greater than allocated vertices.

rmg-nik/sdl_batch,rmg-nik/sdl_batch,rmg-nik/sdl_batch,rmg-nik/sdl_batch,rmg-nik/sdl_batch,rmg-nik/sdl_batch,rmg-nik/sdl_batch,rmg-nik/sdl_batch