PCI: vmd: Fix uninitialized variable usage in vmd_enable_domain()

The ret variable in the vmd_enable_domain() function was used
uninitialized when printing a warning message upon failure of
the pci_reset_bus() function.

Thus, fix the issue by assigning ret with the value returned from
pci_reset_bus() before referencing it in the warning message.

This was detected by Smatch:

  drivers/pci/controller/vmd.c:931 vmd_enable_domain() error: uninitialized symbol 'ret'.

[kwilczynski: drop the second patch from the series, add missing reported
by tag, commit log]
Fixes: 0a58465 ("PCI: vmd: Fix secondary bus reset for Intel bridges")
Link: https://lore.kernel.org/all/[email protected]
Link: https://lore.kernel.org/linux-pci/[email protected]
Reported-by: kernel test robot <[email protected]>
Reported-by: Dan Carpenter <[email protected]>
Signed-off-by: Xinghui Li <[email protected]>
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Reviewed-by: Nirmal Patel <[email protected]>

Author: Xinghui Li

drivers/pci/controller/vmd.c

@@ -927,7 +927,8 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
 		if (!list_empty(&child->devices)) {
 			dev = list_first_entry(&child->devices,
 					       struct pci_dev, bus_list);
-			if (pci_reset_bus(dev))
+			ret = pci_reset_bus(dev);
+			if (ret)
 				pci_warn(dev, "can't reset device: %d\n", ret);
 
 			break;