steer_backhaul: use generator to construct cmdu

src/cntlr_commands_impl.c

@@ -1313,20 +1313,11 @@ int COMMAND(steer_backhaul)(void *priv, void *args, void *out)
 		/* TODO: find opclass and channel from target bssid. */
 
 		/* prepare Backhaul-Steer request */
-		cmdu = cmdu_alloc_simple(CMDU_BACKHAUL_STEER_REQUEST, &mid);
+		cmdu = cntlr_gen_backhaul_steer_request(c, agent, bsta, tbssid,
+							opclass, channel);
 		if (!cmdu) {
-			dbg("%s: -ENOMEM\n", __func__);
-			return -ENOMEM;
-		}
-
-		ret = cntlr_gen_backhaul_steer_req(c, cmdu,
-						   bsta,
-						   tbssid,
-						   opclass,
-						   channel);
-		if (ret) {
-			cmdu_free(cmdu);
-			goto error;
+			dbg("%s: Error generating CMDU\n", __func__);
+			return -EINVAL;
 		}
 	}