rename on socket fails :-(

[michael butler]

Just upgraded my mail-server to -current only to be greated by:

Feb 18 16:26:00 mail authdaemond: modules="authpam", daemons=5
Feb 18 16:26:00 mail authdaemond: Installing libauthpam
Feb 18 16:26:00 mail authdaemond: Installation complete: authpam
Feb 18 16:26:00 mail authdaemond: /var/run/authdaemond/socket: Cross-device
link

Essentially, authdaemond creates /var/run/authdaemond/socket.tmp and then
tries to rename it to the above. In releng7_4, this worked, on -current, it
doesn't. What broke it? This is on a normal UFS2 + soft-updates file-system
:-(

	imb
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