Slot power control breaks build on FreeBSD

[mmatuska]

a9520e6 breaks build on FreeBSD, as zpool_disk_wait() has not been implemented for FreeBSD

In addition, zpool_power_current_state() and zpool_power() should include (void) lines to suppress unused parameter warnings.

System information

Type	Version/Name
Distribution Name	FreeBSD
Distribution Version	main (freebsd/freebsd-src@9bf957fc9)
Kernel Version	freebsd/freebsd-src@9bf957fc9
Architecture	amd64
OpenZFS Version	zfs-2.2.99-279-g233d34e47

Describe the problem you're observing

OpenZFS cannot be build, as the FreeBSD implementation of zpool_disk_wait() introduced in a9520e6 is missing.

Describe how to reproduce the problem

Try to build OpenZFS

Include any warning/errors/backtraces from the system logs

[mmatuska]

@tonyhutter @behlendorf it would be great to to test at least building on both Linux and FreeBSD before doing commits.

[rincebrain]

It should, but it appears sometime in the last couple days the FreeBSD 13-stable builder stopped running things for some reason, since it reported a failure on #15695...

[tonyhutter]

Yea, looks like buildbot was messed up. I just re-strarted it. Hopefully that and #15716 will get things back to normal.

[rincebrain]

Is there any way we could modify the config so the buildbot failing to report any FBSD tests fails closed, e.g. and blocks the PR merge, rather than failing open?

[mmatuska]

Fixed in 07e95b4 #15716