ia64: Remove stale irq_chip.end

irq_chip.end got obsolete with the removal of __do_IRQ().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tony Luck <tony.luck@intel.com>
LKML-Reference: <20110203004210.143127544@linutronix.de>

arch/ia64/kernel/irq_lsapic.c

@@ -40,6 +40,5 @@ struct irq_chip irq_type_ia64_lsapic = {
 	.enable =	lsapic_noop,
 	.disable =	lsapic_noop,
 	.ack =		lsapic_noop,
-	.end =		lsapic_noop,
 	.retrigger =	lsapic_retrigger,
 };