i2c: mlxbf: Fix the return check of devm_ioremap and ioremap
devm_ioremap and ioremap may return NULL which cannot be checked by IS_ERR. Signed-off-by: Wang Xiaojun <wangxiaojun11@huawei.com> Reported-by: Hulk Robot <hulkci@huawei.com> Acked-by: Khalil Blaiech <kblaiech@nvidia.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
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