f2fs: replace logical value "true" with a int number

The "true" is not match the parametera type "int", and
we modify it.

Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>