Revert bogus IRQ_INPROGRESS clear.

It's incorrect for any user of the non-synchronizing irq_disable_nosync().

Cset exclude: torvalds@home.osdl.org|ChangeSet|20031013020955|28777

arch/i386/kernel/irq.c

@@ -380,7 +380,7 @@ void enable_irq(unsigned int irq)
 	spin_lock_irqsave(&desc->lock, flags);
 	switch (desc->depth) {
 	case 1: {
-		unsigned int status = desc->status & ~(IRQ_DISABLED | IRQ_INPROGRESS);
+		unsigned int status = desc->status & ~IRQ_DISABLED;
 		desc->status = status;
 		if ((status & (IRQ_PENDING | IRQ_REPLAY)) == IRQ_PENDING) {
 			desc->status = status | IRQ_REPLAY;