Disable Xorg.0.log

[Beeblebrox]

I have diskless clients running X.org.
/var is mounted from conf/base/var.cpio.gz, and is defined with md_size 6144.
Starting X populates the log file, which quickly fills up the md assigned to /var. I don't need Xorg.0.log for the time being, so how can I disable it?

These are the solutions (which don't work) that I have found:
1. Set /dev/null as logfile - The X.org amn page specifies "-logfile filename" as a command line switch. The equivalent setting for xorg.xonf is NOT {Option  "logfile" "/dev/nul/somefile".
2. ln -s /dev/null/somefile /var/log/Xorg.0.log - will not work because X always moves the old file and creates a new log on each start-up.

Any ideas?
Regards.
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FreeBSD_amd64_11-Current_RadeonKMS