libxl: fix crash when initializing driver

Commit 54a401af split out DriverConfigInit from DriverConfigNew, but
then called it a bit late from libxlStateInitialize. The cfg is used in
libxlDriverConfigLoadFile and when uninitialized results in a crash.
Calling DriverConfigInit immediately after DriverConfigNew fixes the
crash.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/libxl/libxl_driver.c

@@ -702,14 +702,14 @@ libxlStateInitialize(bool privileged,
     if (!(cfg = libxlDriverConfigNew()))
         goto error;
 
+    if (libxlDriverConfigInit(cfg) < 0)
+        goto error;
+
     driverConf = g_strdup_printf("%s/libxl.conf", cfg->configBaseDir);
 
     if (libxlDriverConfigLoadFile(cfg, driverConf) < 0)
         goto error;
 
-    if (libxlDriverConfigInit(cfg) < 0)
-        goto error;
-
     /* Register the callbacks providing access to libvirt's event loop */
     libxl_osevent_register_hooks(cfg->ctx, &libxl_osevent_callbacks, cfg->ctx);