RDMA I/O engine: Fix compiler warnings

Fix 32-bit mode compiler warnings and a warning about an unused variable.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Cc: Ren Yufei <renyufei83@yahoo.com.cn>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
1 file changed