0004654: Invalid reads in top

[Cristian Cadar]

http://bugs.busybox.net/view.php?id=4654

$ ./top d
top: invalid number '$-3õ½-$-3õ½-$-3õ½Eõ½õ½Uõ½õ½Eõ½
$-3õ½U

top should require an argument when the "d" option is used, as in the
procps top:

$ top d
       top: -d requires argument

Thanks,
Cristian