irqchip/renesas-intc-irqpin: Remove devm_kzalloc() error printing

There is no need to print a message if devm_kzalloc() fails, as the
memory allocation core already takes care of that.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>