gctl_delete_param
error = gctl_delete_param(req, GPART_PARAM_INDEX);
error = gctl_delete_param(req, GPART_PARAM_PARTCODE);
(void)gctl_delete_param(req, "nargs");
error = gctl_delete_param(req, "alignment");
error = gctl_delete_param(req, "alignment");
int gctl_delete_param(struct gctl_req *req, const char *name);