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[ Upstream commit4745ea2628] Return NULL instead of passing to ERR_PTR while err is zero, this fix smatch warnings: drivers/xen/xen-pciback/conf_space_capability.c:163 pm_ctrl_init() warn: passing zero to 'ERR_PTR' Fixes:a92336a117("xen/pciback: Drop two backends, squash and cleanup some code.") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Reviewed-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20211008074417.8260-1-yuehaibing@huawei.com Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>