Revert "Paranoid integer overflow check in osGetMBlocks"

This reverts commit 1247dff7b852d45dc5006ae8be33ac991cc76c74.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Revert "Paranoid integer overflow check in my_mmap"

This reverts commit 1ce65edbff90fc8103062a1f94258ecc0c682309.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Revert "Check for integer overflow in osGetMBlocks"

This reverts commit 48865521de6638240819b3979edbb3d33401dc8e.

Signed-off-by: Austin Seipp <aseipp@pobox.com>