Add NULL power handler to x86/ipmi(4)

[Paul Goyette <paul%whooppee.com@localhost>]

Is there any reason anyone can think of to not add a NULL power handler 
to the ipmi(4) driver?  I can't see any reason for anything special to 
happen either at suspend or resume, and the lack of a power handler 
prevents the system from going to sleep at all.

Proposed patch is attached.

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Index: ipmi.c
===================================================================
RCS file: /cvsroot/src/sys/arch/x86/x86/ipmi.c,v
retrieving revision 1.46
diff -u -p -r1.46 ipmi.c
--- ipmi.c      10 Apr 2010 19:02:39 -0000      1.46
+++ ipmi.c      16 Jul 2010 12:19:09 -0000
@@ -1934,6 +1934,10 @@ ipmi_thread(void *cookie)
        sc->sc_wdog.smw_tickle = ipmi_watchdog_tickle;
        sysmon_wdog_register(&sc->sc_wdog);
 
+       /* Set up a NULL power handler so we can possibly sleep */
+       if (!pmf_device_register(self, NULL, NULL))
+                aprint_error_dev(self, "couldn't establish a power handler\n");
+
        mutex_enter(&sc->sc_poll_mtx);
        while (sc->sc_thread_running) {
                ipmi_refresh_sensors(sc);