[RFA] top.c (set_verbose): Assert showcmd was found.

[Joel Brobecker]

> 2011-03-04  Michael Snyder  <msnyder@vmware.com>
> 
> 	* top.c (set_verbose): Assert showcmd was found.

No objection.

>    showcmd = lookup_cmd_1 (&cmdname, showlist, NULL, 1);
> +  gdb_assert (showcmd != NULL
> +	      && showcmd != (struct cmd_list_element *) -1);

I wonder if we shouldn't be defining a constant for this, such as
AMBIGUOUS_COMMAND_NAME, or somesuch.  It would allow us to avoid
the ugly cast everytime we check the return value from this routine.

-- 
Joel