blktap2: remove warnings.

blktap2: remove warnings.

This patch removes the following warnings on ia64.

> linux-2.6.18-xen.hg/drivers/xen/blktap2/device.c: In function
  'blktap_device_finish_request':
> linux-2.6.18-xen.hg/drivers/xen/blktap2/device.c:403: warning:
  format '%lld' expects type 'long long int', but argument 7 has type 'uint64_t'
> linux-2.6.18-xen.hg/drivers/xen/blktap2/sysfs.c: In function
  'blktap_sysfs_debug_device':
> linux-2.6.18-xen.hg/drivers/xen/blktap2/sysfs.c:276: warning: format
  '%llu' expects type 'long long unsigned int', but argument 4 has type
  'uint64_t'

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>