Revert "genirq: temporary fix for level-triggered IRQ resend"

This reverts commit 0fc4969b.  It was
always meant to be temporary, but it's generating more useless noise
than anything else, and we probably should never have done it in the
generic kernel (only had the people involved test it on their own).
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

kernel/irq/resend.c

@@ -62,15 +62,6 @@ void check_irq_resend(struct irq_desc *desc, unsigned int irq)
 	 */
 	desc->chip->enable(irq);
 
-	/*
-	 * Temporary hack to figure out more about the problem, which
-	 * is causing the ancient network cards to die.
-	 */
-	if (desc->handle_irq != handle_edge_irq) {
-		WARN_ON_ONCE(1);
-		return;
-	}
-
 	if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
 		desc->status = (status & ~IRQ_PENDING) | IRQ_REPLAY;