thunderbolt: Fix for v5.11-rc7

A single fix for a possible NULL pointer dereference when adding device
 links from ACPI description.
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Merge tag 'thunderbolt-for-v5.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt into usb-linus

Mika writes:

thunderbolt: Fix for v5.11-rc7

A single fix for a possible NULL pointer dereference when adding device
links from ACPI description.

* tag 'thunderbolt-for-v5.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/westeri/thunderbolt:
  thunderbolt: Fix possible NULL pointer dereference in tb_acpi_add_link()

drivers/thunderbolt/acpi.c

@@ -56,7 +56,7 @@ static acpi_status tb_acpi_add_link(acpi_handle handle, u32 level, void *data,
 	 * managed with the xHCI and the SuperSpeed hub so we create the
 	 * link from xHCI instead.
 	 */
-	while (!dev_is_pci(dev))
+	while (dev && !dev_is_pci(dev))
 		dev = dev->parent;
 
 	if (!dev)