PATCH: S/390: don't try to read zero bytes

[Andrew Cagney]

> 2001-12-20  Jim Blandy  <jimb@redhat.com>
> 
> * s390-tdep.c (s390_readinstruction): Don't call
> 	info->read_memory_func to read zero bytes.  Some targets'
> 	xfer_memory functions can't cope with that.
> 


Jim, which?

While slightly stupid, the target should be able to handle that.

	Andrew