tpm_crb: Use IOMEM_ERR_PTR when function returns iomem
This is to simplify the code, and IOMEM_ERR_PTR(err) is same with (__force void __iomem *)ERR_PTR(err). Signed-off-by: Tian Tao <tiantao6@hisilicon.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
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