3aaa376342
This is closely related to the previous commit: if the credentials dir is empty and nothing mounted on it, let's remove it again. This will in particular happen if we decided to not actually install the mount we prepared for the credentials because it is empty. In that case the mount point inode is already there, and with this we'll remove it. Primary effect, users will see ENOENT rather than EACCESS when trying to access it, which should be preferable, given we already handle that nicely in our credential consumption code. This should also be useful on systems where we lack any privs to create mounts, and thus operate on a regular dir anyway.
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