f2fs: fix to release node block count in error path of f2fs_new_node_page()

It missed to call dec_valid_node_count() to release node block count
in error path, fix it.

Fixes: 141170b7 ("f2fs: fix to avoid use f2fs_bug_on() in f2fs_new_node_page()")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/node.c

@@ -1329,6 +1329,7 @@ struct page *f2fs_new_node_page(struct dnode_of_data *dn, unsigned int ofs)
 	}
 	if (unlikely(new_ni.blk_addr != NULL_ADDR)) {
 		err = -EFSCORRUPTED;
+		dec_valid_node_count(sbi, dn->inode, !ofs);
 		set_sbi_flag(sbi, SBI_NEED_FSCK);
 		f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
 		goto fail;
@@ -1355,7 +1356,6 @@ struct page *f2fs_new_node_page(struct dnode_of_data *dn, unsigned int ofs)
 	if (ofs == 0)
 		inc_valid_inode_count(sbi);
 	return page;
-
 fail:
 	clear_node_page_dirty(page);
 	f2fs_put_page(page, 1);