f2fs: remove repeated f2fs_bug_on

f2fs: remove repeated f2fs_bug_on which has already existed
      in function invalidate_blocks.
Signed-off-by: Zhikang Zhang <zhangzhikang1@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/node.c

@@ -702,7 +702,6 @@ static void truncate_node(struct dnode_of_data *dn)
 	struct node_info ni;
 
 	get_node_info(sbi, dn->nid, &ni);
-	f2fs_bug_on(sbi, ni.blk_addr == NULL_ADDR);
 
 	/* Deallocate node address */
 	invalidate_blocks(sbi, ni.blk_addr);
@@ -2238,7 +2237,6 @@ int recover_xattr_data(struct inode *inode, struct page *page)
 
 	/* 1: invalidate the previous xattr nid */
 	get_node_info(sbi, prev_xnid, &ni);
-	f2fs_bug_on(sbi, ni.blk_addr == NULL_ADDR);
 	invalidate_blocks(sbi, ni.blk_addr);
 	dec_valid_node_count(sbi, inode, false);
 	set_node_addr(sbi, &ni, NULL_ADDR, false);