venus: Fix leak in syncobj creation failure path

CID: 1475984 Resource leak
Signed-off-by: Corentin Noël <corentin.noel@collabora.com>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35474>

src/virtio/vulkan/vn_renderer_virtgpu.c

@@ -158,6 +158,8 @@ sim_syncobj_create(struct virtgpu *gpu, bool signaled)
       sim.syncobjs = _mesa_pointer_hash_table_create(NULL);
       if (!sim.syncobjs) {
          mtx_unlock(&sim.mutex);
+         mtx_destroy(&syncobj->mutex);
+         free(syncobj);
          return 0;
       }
 
@@ -172,6 +174,8 @@ sim_syncobj_create(struct virtgpu *gpu, bool signaled)
          _mesa_hash_table_destroy(sim.syncobjs, NULL);
          sim.syncobjs = NULL;
          mtx_unlock(&sim.mutex);
+         mtx_destroy(&syncobj->mutex);
+         free(syncobj);
          return 0;
       }