RDMA/rtrs-clt: Output sg index when warning on

Output the sg index, so it's a bit easier for debug.

Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Reviewed-by: Aleksei Marov <aleksei.marov@ionos.com>
Link: https://lore.kernel.org/r/20220818105355.110344-2-haris.iqbal@ionos.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>