Removes this useless error that appears on some modern machines:

RTC BIOS diagnostic error 
ff<clock_battery,ROM_cksum,config_unit,memory_size,fixed_disk,invalid_time>


Index: sys/arch/amd64/isa/clock.c
===================================================================
RCS file: /cvs/src/sys/arch/amd64/isa/clock.c,v
retrieving revision 1.24
diff -u -p -u -p -r1.24 clock.c
--- sys/arch/amd64/isa/clock.c  25 Jan 2017 08:23:50 -0000      1.24
+++ sys/arch/amd64/isa/clock.c  11 Aug 2017 21:08:43 -0000
@@ -157,16 +157,10 @@ u_long rtclock_tval;
 void
 startclocks(void)
 {
-       int s;
-
        mtx_enter(&timer_mutex);
        rtclock_tval = TIMER_DIV(hz);
        i8254_startclock();
        mtx_leave(&timer_mutex);
-
-       /* Check diagnostic status */
-       if ((s = mc146818_read(NULL, NVRAM_DIAG)) != 0) /* XXX softc */
-               printf("RTC BIOS diagnostic error %b\n", s, NVRAM_DIAG_BITS);
 }
 
 int

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