m68k/mac: Avoid soft-lockup warning after mach_power_off

Disable interrupts for power-off, like other platforms do. This prevents
meaningless warnings from the soft-lockup detector on models with a power
supply unit not under software control.
Reported-by: Stan Johnson <userm57@yahoo.com>
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

arch/m68k/mac/misc.c

@@ -474,8 +474,9 @@ void mac_poweroff(void)
 		pmu_shutdown();
 #endif
 	}
-	local_irq_enable();
+
 	pr_crit("It is now safe to turn off your Macintosh.\n");
+	local_irq_disable();
 	while(1);
 }
 
@@ -565,8 +566,8 @@ void mac_reset(void)
 	}
 
 	/* should never get here */
-	local_irq_enable();
 	pr_crit("Restart failed. Please restart manually.\n");
+	local_irq_disable();
 	while(1);
 }