Escape minus signs in manpage to fix lintian warning:

I: fio: hyphen-used-as-minus-sign usr/share/man/man1/fio.1.gz:934

see:
http://lintian.debian.org/tags/hyphen-used-as-minus-sign.html

Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed