Fix error on fs pool build failure

https://bugzilla.redhat.com/show_bug.cgi?id=1119592

Introduced by commit 62927dd8 v0.7.6.

src/storage/storage_backend_fs.c

@@ -798,7 +798,7 @@ virStorageBackendFileSystemBuild(virConnectPtr conn ATTRIBUTE_UNUSED,
                             VIR_DIR_CREATE_FORCE_PERMS |
                             VIR_DIR_CREATE_ALLOW_EXIST |
                             (pool->def->type == VIR_STORAGE_POOL_NETFS
-                            ? VIR_DIR_CREATE_AS_UID : 0)) < 0)) {
+                            ? VIR_DIR_CREATE_AS_UID : 0))) < 0) {
         virReportSystemError(-err, _("cannot create path '%s'"),
                              pool->def->target.path);
         goto error;