gpio: pcie-idio-24: Fix irq mask when masking

Fix the bitwise operation to remove only the corresponding bit from the
mask.

Fixes: 58556204 ("gpio: Add GPIO support for the ACCES PCIe-IDIO-24 family")
Cc: stable@vger.kernel.org
Signed-off-by: Arnaud de Turckheim <quarium@gmail.com>
Reviewed-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/gpio-pcie-idio-24.c

@@ -339,7 +339,7 @@ static void idio_24_irq_mask(struct irq_data *data)
 
 	raw_spin_lock_irqsave(&idio24gpio->lock, flags);
 
-	idio24gpio->irq_mask &= BIT(bit_offset);
+	idio24gpio->irq_mask &= ~BIT(bit_offset);
 	new_irq_mask = idio24gpio->irq_mask >> bank_offset;
 
 	if (!new_irq_mask) {