f2fs: upset segment_info repair

upset segment_info like this:

276000|161 0|0   4|70  3|0   3|0   0|0   0|91  4|0   4|232 4|39
276104|0   4|0   4|1   4|0   4|0   4|280 4|0   4|42  4|262 4|38
276204|179 4|89  4|39  4|24  4|0   4|96  4|3   4|428 4|0   4|118
276304|112 4|97  4|0   4|0   4|0   4|68  4|0   4|0   4|86  4|138
276404|0   4|0   0|166 5|39  4|101 0|111

Signed-off-by: Yunlei He <heyunlei@huawei.com>
Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>