[RFA] Handle stack underflow in dbxread.c

[Andrew Cagney]

Thanks!  Don't forget to post the ChangeLog and patch.

Andrew
> I added the following comment:
> 
> /* Pop a context block.  Returns the address of the context block just
>    popped. */
> 
> On Monday, November 18, 2002, at 03:42 PM, Andrew Cagney wrote:
> 
> BTW, can you please put some sort of equivalent comment back?
> 
> -/* Macro "function" for popping contexts from the stack.  Pushing is
> -   done by a real function, push_context.  This returns a pointer to a
> -   struct context_stack.  */
> -
> -#define    pop_context() (&context_stack[--context_stack_depth]);
> 
> Andrew
> 
> 
> 
>