powerpc/85xx: remove setup_irq(NULL action) in ksi8560

setup_irq(0, NULL) is broken as setup_irq() dereferences action
unconditionally.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
1 file changed