dmaengine: moxart: remove NO_IRQ

The use of NO_IRQ is incorrect here and should never have been there,
as irq_of_parse_and_map() returns '0' on failure, not NO_IRQ.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>