RDMA/isert: Suppress gcc 7 fall-through complaints

Avoid that gcc 7 reports the following warning when building with W=1:

warning: this statement may fall through [-Wimplicit-fallthrough=]
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Acked-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/ulp/isert/ib_isert.c

@@ -788,10 +788,11 @@ isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
 		 * the rdma cm id
 		 */
 		return 1;
-	case RDMA_CM_EVENT_REJECTED:       /* FALLTHRU */
+	case RDMA_CM_EVENT_REJECTED:
 		isert_info("Connection rejected: %s\n",
 			   rdma_reject_msg(cma_id, event->status));
-	case RDMA_CM_EVENT_UNREACHABLE:    /* FALLTHRU */
+		/* fall through */
+	case RDMA_CM_EVENT_UNREACHABLE:
 	case RDMA_CM_EVENT_CONNECT_ERROR:
 		ret = isert_connect_error(cma_id);
 		break;
@@ -1569,9 +1570,7 @@ isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
 			transport_generic_free_cmd(&cmd->se_cmd, 0);
 			break;
 		}
-		/*
-		 * Fall-through
-		 */
+		/* fall through */
 	default:
 		iscsit_release_cmd(cmd);
 		break;
@@ -1749,8 +1748,9 @@ isert_do_control_comp(struct work_struct *work)
 	switch (cmd->i_state) {
 	case ISTATE_SEND_TASKMGTRSP:
 		iscsit_tmr_post_handler(cmd, cmd->conn);
-	case ISTATE_SEND_REJECT:   /* FALLTHRU */
-	case ISTATE_SEND_TEXTRSP:  /* FALLTHRU */
+		/* fall through */
+	case ISTATE_SEND_REJECT:
+	case ISTATE_SEND_TEXTRSP:
 		cmd->i_state = ISTATE_SENT_STATUS;
 		isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
 				     ib_dev, false);