lbutils: simplify getprogname usage

the functions no longer return errors, so i don't
need to handle them.

furthermore, the handling in state.c is redundant,
so i've removed that too.

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/libreboot-utils/mkhtemp.c

@@ -62,8 +62,7 @@ main(int argc, char *argv[])
 	int type = MKHTEMP_FILE;
 
 	(void) errhook(exit_cleanup);
-	if (lbsetprogname(argv[0]) == NULL)
-		err_exit(errno, "could not set progname");
+	(void) lbsetprogname(argv[0]);
 
 	/* https://man.openbsd.org/pledge.2 */
 	xpledgex("stdio flock rpath wpath cpath", NULL);