f2fs: fix error handling in fsync_node_pages

In fsync_node_pages, if f2fs was taged with CP_ERROR_FLAG, make sure bio
cache was flushed before return.
Signed-off-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/node.c

@@ -1339,7 +1339,8 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
 			if (unlikely(f2fs_cp_error(sbi))) {
 				f2fs_put_page(last_page, 0);
 				pagevec_release(&pvec);
-				return -EIO;
+				ret = -EIO;
+				goto out;
 			}
 
 			if (!IS_DNODE(page) || !is_cold_node(page))
@@ -1412,7 +1413,7 @@ int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode,
 		unlock_page(last_page);
 		goto retry;
 	}
-
+out:
 	if (nwritten)
 		f2fs_submit_merged_bio_cond(sbi, NULL, NULL, ino, NODE, WRITE);
 	return ret ? -EIO: 0;