[issue1016] mount_cd9660 crashes the kernel

[Matthew Dillon]

    The crash dump is really helpful.  I have reproduced it.  What is
    happening is that cdcheckmedia() is being called before the slice
    table is getting set up.  I think adding some simple conditionals to
    those dsioctl()'s will solve the problem.

    I should have a fix for the mount_cd9660 issue committed today.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>