[RFC/i385newframe] Fix sigtramp unwinder.

[Mark Kettenis]

   Date: Wed, 28 May 2003 16:39:23 +0200
   From: Michal Ludvig <mludvig@suse.cz>

   Hi,
   this patch fixes x86_64_linux_sigcontext_addr() which returned wrong 
   address, and consequently enables unwinding from signal handlers.
   Detailed explanation of this change is in the comment in the patch.
   OK to apply?

Oops.  Of course...  There was a slight problem...  You left an unused
variable.  I fixed it and checked it in.

Thanks!

Mark