RDMA/irdma: Use s/g array in post send only when its valid

Send with invalidate verb call can pass in an
uninitialized s/g array with 0 sge's which is
filled into irdma WQE and causes a HW asynchronous
event.

Fix this by using the s/g array in irdma post send
only when its valid.

Fixes: 551c46e ("RDMA/irdma: Add user/kernel shared libraries")
Signed-off-by: Sindhu-Devale <sindhu.devale@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Link: https://lore.kernel.org/r/20220906223244.1119-5-shiraz.saleem@intel.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

Author: Sindhu-Devale

drivers/infiniband/hw/irdma/uk.c

@@ -497,7 +497,8 @@ int irdma_uk_send(struct irdma_qp_uk *qp, struct irdma_post_sq_info *info,
 			      FIELD_PREP(IRDMAQPSQ_IMMDATA, info->imm_data));
 		i = 0;
 	} else {
-		qp->wqe_ops.iw_set_fragment(wqe, 0, op_info->sg_list,
+		qp->wqe_ops.iw_set_fragment(wqe, 0,
+					    frag_cnt ? op_info->sg_list : NULL,
 					    qp->swqe_polarity);
 		i = 1;
 	}