The platform_get_irq() function returns negative if an error occurs.
zero or positive number on success. platform_get_irq() error checking
for zero is not correct.
Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com>
Acked-by: NKevin Hilman <khilman@baylibre.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>