f2fs: fix wrong written_valid_blocks counting

Previously, written_valid_blocks was got by ckpt->valid_block_count. But if
the last checkpoint has some NEW_ADDR due to power-cut, we can get wrong value.
Fix it to get the number from actual written block count from sit entries.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
1 file changed