f2fs: fix to handle error path correctly in f2fs_map_blocks

In f2fs_map_blocks(), we should bail out once __allocate_data_block()
failed.

Fixes: f847c699 ("f2fs: allow out-place-update for direct IO in LFS mode")
Signed-off-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/data.c

@@ -1195,10 +1195,10 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
 		if (test_opt(sbi, LFS) && flag == F2FS_GET_BLOCK_DIO &&
 							map->m_may_create) {
 			err = __allocate_data_block(&dn, map->m_seg_type);
-			if (!err) {
-				blkaddr = dn.data_blkaddr;
-				set_inode_flag(inode, FI_APPEND_WRITE);
-			}
+			if (err)
+				goto sync_out;
+			blkaddr = dn.data_blkaddr;
+			set_inode_flag(inode, FI_APPEND_WRITE);
 		}
 	} else {
 		if (create) {