commit 2827a418ca1b23e432e62c9b3d0e7cf3255dfe88
author Alexandru Moise <00moses.alexander00@gmail.com> Tue Sep 19 22:04:12 2017 +0200
committer Thomas Gleixner <tglx@linutronix.de> Mon Sep 25 16:40:31 2017 +0200
tree f714a36e5dccc31387bc54c7162ce6e8a2fb2f22
parent e19b205be43d11bff638cad4487008c48d21c103

genirq: Check __free_irq() return value for NULL

__free_irq() can return a NULL irqaction for example when trying to free
already-free IRQ, but the callsite unconditionally dereferences the
returned pointer.

Fix this by adding a check and return NULL.

Signed-off-by: Alexandru Moise <00moses.alexander00@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20170919200412.GA29985@gmail.com