[PATCH] checkpoint: use syscall_get_error

[Serge E. Hallyn]

Quoting Nathan Lynch (ntl at pobox.com):
> On Fri, 2010-03-12 at 12:26 -0600, Nathan Lynch wrote:
> > restore_retval() uses the result of syscall_get_return_value() to
> > determine whether a syscall is to return an error.  This isn't
> > portable and doesn't work on powerpc.  Instead, use
> > syscall_get_error(), which encapsulates the arch-specific logic for
> > determining syscall error state.
> 
> This one seems likely to change behavior on s390; Serge are you able to
> check?
> 

Looks like it should do the right thing, and cr_tests are still passing,
so

Acked-by: Serge Hallyn <serue at us.ibm.com>
Tested-by: Serge Hallyn <serue at us.ibm.com>

thanks,
-serge