drivers/clocksource/tcb_clksrc.c: fix init sequence

setup_irq() was called before clockevents_register_device() which is
needed by the irq handler. Bug was reproducible by restarting the
kernel using kexec (reliable crash).

Signed-off-by: Nikolaus Voss <[e-mail]>
Cc: David Brownell <[e-mail]>
Cc: Haavard Skinnemoen <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/clocksource/tcb_clksrc.c

···
 	clkevt.clkevt.min_delta_ns = clockevent_delta2ns(1, &clkevt.clkevt) + 1;
 	clkevt.clkevt.cpumask = cpumask_of(0);
 
-	setup_irq(irq, &tc_irqaction);
-
 	clockevents_register_device(&clkevt.clkevt);
+
+	setup_irq(irq, &tc_irqaction);
 }
 
 #else /* !CONFIG_GENERIC_CLOCKEVENTS */