Input: ucb1400_ts - IRQ probe fix

The UCB1400 driver IRQ probe code fails to find an interrupt if all
the interrupts in the range 0-31 are nonprobe-able. This patch
removes the check of the return value so interrupts above 31 can be
detected.

Tested on InHand Fingertip4 PXA270 board.
Signed-off-by: NVernon Sauder <vsauder@inhand.com>
Acked-by: NNicolas Pitre <nico@marvell.com>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>

drivers/input/touchscreen/ucb1400_ts.c

@@ -427,10 +427,6 @@ static int ucb1400_detect_irq(struct ucb1400 *ucb)
 	unsigned long mask, timeout;
 
 	mask = probe_irq_on();
-	if (!mask) {
-		probe_irq_off(mask);
-		return -EBUSY;
-	}
 
 	/* Enable the ADC interrupt. */
 	ucb1400_reg_write(ucb, UCB_IE_RIS, UCB_IE_ADC);