[ARM] Remove SA1111 PS/2 IRQ_HANDLED handling.

Some SA1111 devices are unable to clear the PS/2 receive IRQ before
it has been serviced, so we always re-enter the handler one more
time than is strictly necessary.  We can't clear the IRQ after
servicing because that causes race conditions with other SA1111
devices, so we take the easy option and always return IRQ_HANDLED.

drivers/input/serio/sa1111ps2.c

@@ -45,7 +45,6 @@ static irqreturn_t ps2_rxint(int irq, void *dev_id, struct pt_regs *regs)
 {
 	struct ps2if *ps2if = dev_id;
 	unsigned int scancode, flag, status;
-	int handled = IRQ_NONE;
 
 	status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
 	while (status & PS2STAT_RXF) {
@@ -63,11 +62,9 @@ static irqreturn_t ps2_rxint(int irq, void *dev_id, struct pt_regs *regs)
 		serio_interrupt(&ps2if->io, scancode, flag, regs);
 
 		status = sa1111_readl(ps2if->base + SA1111_PS2STAT);
-
-		handled = IRQ_HANDLED;
         }
 
-        return handled;
+        return IRQ_HANDLED;
 }
 
 /*