Make the caller pre-allocate an rdma_req and change req_init() so it
only does initialization, not allocation.
This is necessary to distinguish between rdma_req allocation failure and
other types of failures, which will become important in future patches
when requests will be queued if rdma_req allocation fails.
Change-Id: Ie6edebc1b5f05001b42fc959a29ce0ea6875e41e
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
ee82713678