Revert "staging: erofs: keep corrupted fs from crashing kernel in erofs_namei()"

This reverts commit d4104c5e

.

Turns out it still needs some more work, I merged it to soon :(

Reported-by: Gao Xiang <gaoxiang25@huawei.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>