virglrenderer: fix some memory leaks on cleanup

Writing some unit tests with valgrind, showed we don't always
cleanup properly fix that.

src/virglrenderer.c

@@ -255,6 +255,7 @@ void virgl_renderer_poll(void)
 
 void virgl_renderer_cleanup(void *cookie)
 {
+   vrend_renderer_fini();
    if (use_egl_context) {
       virgl_egl_destroy(egl_info);
       egl_info = NULL;

src/vrend_decode.c

@@ -1008,7 +1008,7 @@ void vrend_renderer_context_destroy(uint32_t handle)
    ret = vrend_destroy_context(ctx->grctx);
    free(ctx);
    /* switch to ctx 0 */
-   if (ret)
+   if (ret && handle != 0)
        vrend_hw_switch_context(dec_ctx[0]->grctx, TRUE);
 }
 

src/vrend_renderer.c

@@ -3177,7 +3177,9 @@ vrend_renderer_fini(void)
    if (!inited)
       return;
 
+   vrend_renderer_context_destroy(0);
    vrend_object_fini_resource_table();
+
    inited = 0;
 }
 
@@ -3245,6 +3247,7 @@ bool vrend_destroy_context(struct vrend_context *ctx)
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
    vrend_bind_va(0);
 
+   vrend_object_fini_ctx_table(ctx->res_hash);
    FREE(ctx);
 
    return switch_0;