kobject: Export kobject_get_unless_zero()

Make the function available for outside use and fortify it against NULL
kobject.

CC: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Acked-by: Tejun Heo <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
2 files changed