in case the previous loop scheduled some more work to do (e.g. reset)
- use queue_freese to block the queue when a reset is pending too
- Avoid using WDCF_TH_RUN in some place that can be called from callout.
If the kernel thread is tsleep()ing somewhere, we may come here with
WDCF_TH_RUN set while being in the callout context. Fix a panic() in
tsleep() reported by Chuck Silvers.
- Use AT_WAIT instead of WDCF_TH_RUN wdcwait(), as we may not be in the
channel's thread context but still be able to tsleep(). Fix queue_freese
panics for WDC_CAPABILITY_NOIRQ controllers (port-mac68k/23208 by
Frederick Bruck).
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