powerpc/eeh_sysfs: Remove double pci_dn lookup.

In eeh_notify_resume_show() the pci_dn for the device is looked up once in
the declaration block and then once after checking for a NULL eeh_dev.
Remove the second lookup since it's pointless.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Reviewed-by: Sam Bobroff <sbobroff@linux.ibm.com>
Tested-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190715085612.8802-5-oohall@gmail.com

arch/powerpc/kernel/eeh_sysfs.c

@@ -86,7 +86,6 @@ static ssize_t eeh_notify_resume_show(struct device *dev,
 	if (!edev || !edev->pe)
 		return -ENODEV;
 
-	pdn = pci_get_pdn(pdev);
 	return sprintf(buf, "%d\n", pdn->last_allow_rc);
 }