ACPICA: fixup after acpi_get_object_info() change

Commit 15b8dd53f5ffa changed info->hardware_id from a static array to a pointer. If hardware_id is non-NULL, it points to a NULL-terminated string, so we don't need to terminate it explicitly. However, it may be NULL; in that case, we *can't* add a NULL terminator.

This causes a NULL pointer dereference oops for devices without _HID.

Signed-off-by Bjorn Helgaas <[email protected]>

CC Lin Ming <[email protected]>

CC Bob Moore <[email protected]>

CC Gary Hade <[email protected]>

---
 drivers/pci/hotplug/acpiphp_ibm.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

drivers/pci/hotplug/acpiphp_ibm.c +0 -1

index a9d926b..e7be66d 100644
@@ -406,7 +406,6 @@ static acpi_status __init ibm_find_acpi_device(acpi_handle handle,
 			__func__, status);
 		return retval;
 	}
-	info->hardware_id.string[sizeof(info->hardware_id.length) - 1] = '\0';
 
 	if (info->current_status && (info->valid & ACPI_VALID_HID) &&
 			(!strcmp(info->hardware_id.string, IBM_HARDWARE_ID1) ||