Remove use of storagePrivateData/networkPrivateData from vbox

The vbox driver can use the main hypervisor private data and
so does not need to use the storage/network private data fields.

src/vbox/vbox_network.c

@@ -102,17 +102,17 @@ vboxNetworkOpen(virConnectPtr conn,
         goto cleanup;
 
     VIR_DEBUG("network initialized");
-    /* conn->networkPrivateData = some network specific data */
+
     return VIR_DRV_OPEN_SUCCESS;
 
  cleanup:
     return VIR_DRV_OPEN_DECLINED;
 }
 
-static int vboxNetworkClose(virConnectPtr conn)
+static int vboxNetworkClose(virConnectPtr conn ATTRIBUTE_UNUSED)
 {
     VIR_DEBUG("network uninitialized");
-    conn->networkPrivateData = NULL;
+
     return 0;
 }
 

src/vbox/vbox_storage.c

@@ -58,14 +58,14 @@ vboxStorageOpen(virConnectPtr conn,
         return VIR_DRV_OPEN_ERROR;
 
     VIR_DEBUG("vbox storage initialized");
-    /* conn->storagePrivateData = some storage specific data */
+
     return VIR_DRV_OPEN_SUCCESS;
 }
 
-static int vboxStorageClose(virConnectPtr conn)
+static int vboxStorageClose(virConnectPtr conn ATTRIBUTE_UNUSED)
 {
     VIR_DEBUG("vbox storage uninitialized");
-    conn->storagePrivateData = NULL;
+
     return 0;
 }