qemuDomainAttachDeviceDiskLiveInternal: Fix jumps on error

When I've originally refactored the function in commit 0d981bcefc
the logic was still correct, but then later in commit 52f8655439
I've moved most of the image setup logic into the function neglecting to
add the 'goto cleanup;' needed to skip over the setup of the disk
images.

Fixes: 52f8655439
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/qemu/qemu_hotplug.c

@@ -931,7 +931,7 @@ qemuDomainAttachDeviceDiskLiveInternal(virQEMUDriver *driver,
         if (disk->device == VIR_DOMAIN_DISK_DEVICE_LUN) {
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                            _("disk device='lun' is not supported for usb bus"));
-            break;
+            goto cleanup;
         }
 
         if (virDomainUSBAddressEnsure(priv->usbaddrs, &disk->info) < 0)
@@ -991,6 +991,7 @@ qemuDomainAttachDeviceDiskLiveInternal(virQEMUDriver *driver,
         virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
                        _("disk bus '%1$s' cannot be hotplugged."),
                        virDomainDiskBusTypeToString(disk->bus));
+        goto cleanup;
     }
 
     if (qemuDomainStorageSourceChainAccessAllow(driver, vm, disk->src) < 0)