PCI: host-generic: Fix NULL pointer dereference on 32-bit CAM systems

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                        "drivers/pci/controller/pci-host-generic.c",
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                        "drivers/pci/controller/pci-host-generic.c",
                        "drivers/pci/ecam.c",
                        "include/linux/pci-ecam.h"
                    ],
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