Revert "cifs: fix double free race when mount fails in cifs_get_root()"

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5TMYD
CVE: NA

--------------------------------

This reverts commit 7959a470.

Commit 2fe0e281f7ad (cifs: fix double free race when mount fails
in cifs_get_root()) fixes a double free. However there is no such
issue on 4.19 because it will return after cifs_cleanup_volume_info().

Since merge this patch, cifs_cleanup_volume_info() is skipped, leading
to a memory leak.
Signed-off-by: NLuo Meng <luomeng12@huawei.com>
Reviewed-by: NZhang Yi <yi.zhang@huawei.com>
Signed-off-by: NYongqiang Liu <liuyongqiang13@huawei.com>

fs/cifs/cifsfs.c

@@ -779,7 +779,6 @@ cifs_smb3_do_mount(struct file_system_type *fs_type,
 
 out_super:
 	deactivate_locked_super(sb);
-	return root;
 out:
 	cifs_cleanup_volume_info(volume_info);
 	return root;