irqchip: Use IS_ERR_OR_NULL() instead of NULL and IS_ERR() checks

irqchip: Use IS_ERR_OR_NULL() instead of NULL and IS_ERR() checks

Prefer using IS_ERR_OR_NULL() over using IS_ERR() and a open coded NULL
pointer check.

Change generated with coccinelle.

To: Marc Zyngier <maz@kernel.org>
To: Thomas Gleixner <tglx@kernel.org>
To: Andrew Lunn <andrew@lunn.ch>
To: Gregory Clement <gregory.clement@bootlin.com>
To: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>

Signed-off-by: Philipp Hahn <phahn-oss@avm.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260310-b4-is_err_or_null-v1-39-bd63b656022d@avm.de