Fetch the entity id for rate commands

src/pipeline.c

@@ -82,7 +82,8 @@ load_entity_ids(libmegapixels_camera *camera)
 					log_error("Could not find entity '%s'\n", cmd->entity_to);
 					return -1;
 				}
-			} else if (cmd->type == LIBMEGAPIXELS_CMD_MODE || cmd->type == LIBMEGAPIXELS_CMD_CROP) {
+			} else if (cmd->type == LIBMEGAPIXELS_CMD_MODE || cmd->type == LIBMEGAPIXELS_CMD_CROP ||
+				cmd->type == LIBMEGAPIXELS_CMD_INTERVAL) {
 				int found = 0;
 				for (int k = 0; k < topology.num_entities; k++) {
 					if (strncmp(entities[k].name, cmd->entity_from, strlen(cmd->entity_from)) == 0) {