MIPS: JZ4740: GPIO: Check correct IRQ in demux handler

Check the trigger direction for the triggered IRQ instead of the parent IRQ.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: http://patchwork.linux-mips.org/patch/2433/


Signed-off-by: Ralf Baechle <ralf@linux-mips.org>