f2fs: fix to update iostat correctly in IPU path

In error path of IPU, we didn't account iostat correctly, fix it.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index adb8365..ceb8ba0 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3179,10 +3179,10 @@
 	stat_inc_inplace_blocks(fio->sbi);
 
 	err = f2fs_submit_page_bio(fio);
-	if (!err)
+	if (!err) {
 		update_device_state(fio);
-
-	f2fs_update_iostat(fio->sbi, fio->io_type, F2FS_BLKSIZE);
+		f2fs_update_iostat(fio->sbi, fio->io_type, F2FS_BLKSIZE);
+	}
 
 	return err;
 }