staging: lustre: libcfs: remove libcfsutil.h in comment

The header libcfsutil.h has been long gone in the upstream
client. Replace libcfsutil.h reference to the current user
land header instead.
Signed-off-by: John L. Hammond <john.hammond@intel.com>
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6245
Reviewed-on: http://review.whamcloud.com/14180Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: frank zago <fzago@cray.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/include/linux/libcfs/libcfs_ioctl.h

@@ -34,7 +34,7 @@
  * libcfs/include/libcfs/libcfs_ioctl.h
  *
  * Low-level ioctl data structures. Kernel ioctl functions declared here,
- * and user space functions are in libcfsutil_ioctl.h.
+ * and user space functions are in libcfs/util/ioctl.h.
  *
  */