interconnect: imx: simplify the return expression of imx_icc_unregister

Simplify the return expression.

Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Link: https://lore.kernel.org/r/20200921082437.2591461-1-liushixin2@huawei.com


Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>