It's possible that the filesystem is not ISO9660, I'm not sure what OS X uses on their installation CD's.
Can you try mount -t udf /dev/cd0c /cdrom, make sure /cdrom exists, UDF is common on DVD disks, and might work.
BTW, what could possibly be on the OS X disk that you need to access from OpenBSD? to reinstall OS X you would just boot from the DVD.
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