virgl: Don't define a local ret variable.

When there is no vulkan support compiled in and user ask for vulkan
support, the current code could fail and clean everything while still
returns success since the outside ret value is not initialized yet.

Signed-off-by: Lepton Wu <lepton@chromium.org>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>

src/virglrenderer.c

@@ -681,7 +681,7 @@ int virgl_renderer_init(void *cookie, int flags, struct virgl_renderer_callbacks
       if (flags & VIRGL_RENDERER_THREAD_SYNC)
          vkr_flags |= VKR_RENDERER_THREAD_SYNC;
 
-      int ret = vkr_renderer_init(vkr_flags);
+      ret = vkr_renderer_init(vkr_flags);
       if (ret)
          goto fail;
       state.vkr_initialized = true;