Author: Kulikov Vasiliy <segooon@gmail.com> If irq2ctlr() fails return IRQ_NONE. Also as it can fail make ‘ctlr’ signed. The semantic patch that finds this problem (many false-positive results): (http://coccinelle.lip6.fr/) // @ r1 @ identifier f; @@ int f(…) { … } @@ identifier r1.f; type T; unsigned T x; @@ *x = f(…) … *x > …