irq_of_parse_and_map() returns 0 on error, so testing for negative
result never works.
Signed-off-by: NDmitry Torokhov <dtor@chromium.org>
Acked-by: NJames Hogan <james.hogan@imgtec.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>