[patch] PCI: acpiphp_ibm: potential uninitialized variable bug

[Dan Carpenter]

If ibm_get_table_from_acpi() fails then "table" isn't initialized.  I
fixed this by adding a check for failure.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/pci/hotplug/acpiphp_ibm.c 
b/drivers/pci/hotplug/acpiphp_ibm.c
index 2f6d3a1..f6221d7 100644
--- a/drivers/pci/hotplug/acpiphp_ibm.c
+++ b/drivers/pci/hotplug/acpiphp_ibm.c
@@ -138,6 +138,8 @@ static union apci_descriptor *ibm_slot_from_id(int id)
        char *table;
 
        size = ibm_get_table_from_acpi(&table);
+       if (size < 0)
+               return NULL;
        des = (union apci_descriptor *)table;
        if (memcmp(des->header.sig, "aPCI", 4) != 0)
                goto ibm_slot_done;