irqchip/renesas-rzg2l: Remove pm_put label

No need to keep label `pm_put`, as it's only used once.
Call pm_runtime_put() directly from the error path.

Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@renesas.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/all/20250212182034.366167-5-fabrizio.castro.jz@renesas.com