Missing null check in rza2_gpio_register

[henry via Bugspray Bot <bugbot@kernel.org>]

henry writes via Kernel.org Bugzilla:

pinctrl: renesas: rza2: Add null check in the rza2_gpio_register

When devm_kasprintf fails, it returns a null pointer. However, this return value is not properly checked in the function rza2_gpio_register. 

A check should be added after the devm_kasprintf call to prevent potential null pointer dereference issues.

CODE:
	chip.label = devm_kasprintf(priv->dev, GFP_KERNEL, "%pOFn", np);
	chip.parent = priv->dev;
	chip.ngpio = priv->npins;

View: https://bugzilla.kernel.org/show_bug.cgi?id=219946#c0
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