hfsplus: don't use BUG_ON() in hfsplus_create_attributes_file()

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UBUNTU-CVE-2021-46988

In the Linux kernel, the following vulnerability has been resolved: userfaultfd: release page in error path to avoid BUGON Consider the following sequence of events: 1. Userspace issues a UFFD ioctl, which ends up calling into shmemmfillatomicpte. We successfully account the blocks, we...