staging: lustre: lustre: obdclass: Added missing line after declaration

Added missing line after declaration fixing the following checkpatch.pl warning in dt_object.c:
WARNING: Missing a blank line after declarations

Signed-off-by: Kumari Radha <kumari.radha3@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>