kobject: Export kobject_get_unless_zero()

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

Change-Id: I76dc2a49293ce967309a882b5067bd85b8fc828e
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
Git-commit: c70c176ff8c3ff0ac6ef9a831cd591ea9a66bd1a
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git


Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>