revert last two commits. vfork cannot be used in subroutine,

it trashes stack on return

util-linux/mount.c

@@ -890,7 +890,6 @@ get_mountport(struct pmap *pm_mnt,
 }
 
 #if BB_MMU
-/* Unlike bb_daemonize(), parent does NOT exit here, but returns 0 */
 static int daemonize(void)
 {
 	int fd;

util-linux/script.c

@@ -87,7 +87,10 @@ int script_main(int argc ATTRIBUTE_UNUSED, char **argv)
 
 	/* TODO: SIGWINCH? pass window size changes down to slave? */
 
-	child_pid = xvfork();
+	child_pid = vfork();
+	if (child_pid < 0) {
+		bb_perror_msg_and_die("vfork");
+	}
 
 	if (child_pid) {
 		/* parent */