PCI: hv: Add missing kfree(hbus) in hv_pci_probe()'s error handling path

Now that we use kzalloc() to allocate the hbus buffer, we must call
kfree() in the error path as well to prevent memory leakage.

Fixes: 877b911a ("PCI: hv: Avoid a kmemleak false positive caused by the hbus buffer")
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>

drivers/pci/controller/pci-hyperv.c

@@ -3058,7 +3058,7 @@ static int hv_pci_probe(struct hv_device *hdev,
 free_dom:
 	hv_put_dom_num(hbus->sysdata.domain);
 free_bus:
-	free_page((unsigned long)hbus);
+	kfree(hbus);
 	return ret;
 }