If a translation returns zero, that means NO_IRQ, so we
should return an error since the function is documented to
return a negative code on error.
Reported-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Acked-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>