o removed an unecessary INIT_LIST_HEAD after LIST_HEAD

o merge a declare & INIT_LIST_HEAD pair into one LIST_HEAD
Signed-off-by: NGui Hecheng <guihc.fnst@cn.fujitsu.com>
Reviewed-by: NDavid Sterba <dsterba@suse.cz>
Signed-off-by: NChris Mason <clm@fb.com>