Error code EAGAIN should be used when errors are temporary and next call
might succeeds.
When error code other than EAGAIN is returned, the caller (mlx4_ib_poll)
will assume all CQE in the same bunch are error too and will drop them all.
Signed-off-by: NYuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>