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If dev_get_regmap() fails, it returns NULL pointer not ERR_PTR(),
replace IS_ERR() with NULL pointer check, and return -ENODEV.
Fixes: d0f8e97866 ("i2c: muxes: add support for tsd,mule-i2c multiplexer")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>