RDMA/core: Fix indentation

Make indentation consistent. Detected by smatch.
Signed-off-by: NBart Van Assche <bart.vanassche@sandisk.com>
Cc: Tatyana Nikolova <Tatyana.E.Nikolova@intel.com>
Cc: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: NSteve Wise <swise@opengridcomputing.com>
Reviewed-by: NSagi Grimberg <sagi@gimberg.me>
Signed-off-by: NDoug Ledford <dledford@redhat.com>