[git commit master] tweak mdev_fat.conf example

[Vladimir Dronnikov]

>
> No. It may have sense sometime ago, when chmod was skipped
> if /dev/null existed, but command was executed even if it
> did exist. Maybe it was working this way many versions ago.

This or that, fun is that mdev users/developers had (still have?) to
workaround their own tool.

BTW, can't help thinking of mdev_fat as of something linked with FAT
filesystem :) Do you?

Regards,
--
Vladimir