Add split to bytes return causing ValueError

Add split '\xc2' to bytes var.

Getting fdisk size of a cdrom (/dev/sr0) returning int(size)+' '+octects
so bytes is a string for sr0 and not an int, causing ValueError: invalid literal for int() with base 10:
Merge pull request #3 from alkanne/patch-1

Add split '\xc2' to 'bytes' var, to solve 'gb' var ValueError.