dsl_destroy_head
error = dsl_destroy_head(name);
error = dsl_destroy_head(clone2name);
error = dsl_destroy_head(clone1name);
error = dsl_destroy_head(clonename);
error = dsl_destroy_head(clonename);
(void) dsl_destroy_head(name);
(void) dsl_destroy_head(dsname);
int dsl_destroy_head(const char *);
(void) dsl_destroy_head(fsname);
(void) dsl_destroy_head(fsname);
err = dsl_destroy_head(zc->zc_name);
err = dsl_destroy_head(namebuf);
err = dsl_destroy_head(zc->zc_name);