tools/kdd: don't use a pointer to an unaligned field.

tools/kdd: don't use a pointer to an unaligned field.

The 'val' field in the packet is byte-aligned (because it is part of a
packed struct), but the pointer argument to kdd_rdmsr() has the normal
alignment constraints for a uint64_t *.  Use a local variable to make sure
the passed pointer has the correct alignment.

Reported-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Tim Deegan <tim@xen.org>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
Tested-by: Roger Pau Monné <roger.pau@citrix.com>