f2fs: remove redundant parameter in is_next_segment_free()

is_next_segment_free() takes a redundant `type` parameter. Remove it.

Signed-off-by: Yifan Zhao <zhaoyifan@sjtu.edu.cn>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>