[Toybox] [Patch] - args.c failure for group [-abc]

[Ashwini Sharma]

Hi Rob,

For the group __ [-abc] __ handling, while clearing the flags for the
options
to be disabled, it cleared args, for any of the set options until then.

Additional check is added to determine the options arg to be cleared.

     for (clr=gof->opts, i=1; clr; clr = clr->next, i<<=1)
-      if (clr->arg && (i & toys.optflags)) *clr->arg = 0;
+      if (clr->arg && (i & toys.optflags) &&
+          (clr->dex[1] & opt->dex[0])) *clr->arg = 0;
     toys.optflags &= ~opt->dex[0];

Patch is attached for the same.

regards,
Ashwini
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