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mailbox: arm_mhuv2: Fix return value check in mhuv2_probe()
[ Upstream commit 165b764 ] If devm_of_iomap() fails, it returns ERR_PTR() and never return NULL, so replace NULL pointer check with IS_ERR() to fix this problem. Fixes: 5a6338c ("mailbox: arm_mhuv2: Add driver") Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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