Fix allocation of virDomainFSDef

Some less commonly used drivers were omitted when we switched
the allocator from a plain VIR_ALLOC to virDomainFSDefNew.

https://bugzilla.redhat.com/show_bug.cgi?id=1846450

Fixes: da665fbdSigned-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>

src/openvz/openvz_conf.c

@@ -357,7 +357,7 @@ openvzReadFSConf(virDomainDefPtr def,
             goto error;
         }
 
-        if (VIR_ALLOC(fs) < 0)
+        if (!(fs = virDomainFSDefNew(NULL)))
             goto error;
 
         veid_str = g_strdup_printf("%d", veid);

src/vbox/vbox_common.c

@@ -3626,7 +3626,7 @@ vboxDumpSharedFolders(virDomainDefPtr def, vboxDriverPtr data, IMachine *machine
         char *hostPath = NULL;
         PRBool writable = PR_FALSE;
 
-        if (VIR_ALLOC(def->fss[i]) < 0)
+        if (!(def->fss[i] = virDomainFSDefNew(data->xmlopt)))
             goto cleanup;
 
         def->fss[i]->type = VIR_DOMAIN_FS_TYPE_MOUNT;