blockdev applet proposal

[Sergey Naumov]

> Please review attached version.
All works fine except I can pass additional (3-rd) parameter at the
end of commands which do not require an argument,
for example ./busybox blockdev --rereadpt /dev/sda a.
It could save some size, but original utility accepts blockdev
--rereadpt /dev/sda /dev/sdb, so, from my point of view, we should
inform user when he tries to provide such an input.
So, I think, we should add

   if (bdcmd->flags & FL_USRARG)
       llu = xatoi_positive(*++argv);
+ else
+     if (argc > 3) bb_show_usage();

Very educational code, thanks =)

Sergey Naumov.
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