f2fs: avoid bug_on when error is occurred

During the recovery, if an error like EIO or ENOMEM, f2fs_bug_on should skip.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/recovery.c

@@ -472,6 +472,7 @@ int recover_fsync_data(struct f2fs_sb_info *sbi)
 
 	/* step #2: recover data */
 	err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
+	if (!err)
 		f2fs_bug_on(!list_empty(&inode_list));
 out:
 	destroy_fsync_dnodes(&inode_list);