i40iw: Free QP PBLEs when the QP is destroyed

If the physical buffer list entries (PBLEs) of a QP are freed
up at i40iw_dereg_mr, they can be assigned to a newly
created QP before the previous QP is destroyed. Fix this
by freeing PBLEs only when the QP is destroyed.

Signed-off-by: Tatyana Nikolova <tatyana.e.nikolova@intel.com>
Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/hw/i40iw/i40iw_verbs.h b/drivers/infiniband/hw/i40iw/i40iw_verbs.h
index 07c3fec..9067443 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_verbs.h
+++ b/drivers/infiniband/hw/i40iw/i40iw_verbs.h
@@ -170,7 +170,7 @@ struct i40iw_qp {
 	struct i40iw_qp_kmode kqp;
 	struct i40iw_dma_mem host_ctx;
 	struct timer_list terminate_timer;
-	struct i40iw_pbl *iwpbl;
+	struct i40iw_pbl iwpbl;
 	struct i40iw_dma_mem q2_ctx_mem;
 	struct i40iw_dma_mem ietf_mem;
 	struct completion sq_drained;