[rfc] Do not read from the executable if ptrace fails

[Joel Brobecker]

> Any comments, or shall I apply this?
> 
> -- 
> Daniel Jacobowitz
> CodeSourcery
> 
> 2007-06-24  Daniel Jacobowitz  <dan@codesourcery.com>
> 
> 	PR symtab/2161
> 	* target.c (memory_xfer_partial): Do not continue past targets with
> 	all memory.

FWIW, it looks pretty good to me, and I think it should be part of 6.7
too.

-- 
Joel