Make err.h a bit more Windows friendly
authorJens Axboe <axboe@fb.com>
Wed, 12 Feb 2014 15:22:01 +0000 (08:22 -0700)
committerJens Axboe <axboe@fb.com>
Wed, 12 Feb 2014 15:22:01 +0000 (08:22 -0700)
Using unsigned long to hold pointers is a linuxism, clean
it up.

Signed-off-by: Jens Axboe <axboe@fb.com>

No differences found