zink: Always set mfence->submit_count to the fence submit_count

Fixes glFinish not finishing all GPU work.

cc: mesa-stable

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8257
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27560>
(cherry picked from commit aed5e4e1f2)

.pick_status.json

@@ -1534,7 +1534,7 @@
         "description": "zink: Always set mfence->submit_count to the fence submit_count",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null,
         "notes": null

src/gallium/drivers/zink/zink_context.c

@@ -3789,7 +3789,6 @@ zink_flush(struct pipe_context *pctx,
    struct zink_batch *batch = &ctx->batch;
    struct zink_fence *fence = NULL;
    struct zink_screen *screen = zink_screen(ctx->base.screen);
-   unsigned submit_count = 0;
    VkSemaphore export_sem = VK_NULL_HANDLE;
 
    /* triggering clears will force has_work */
@@ -3868,7 +3867,6 @@ zink_flush(struct pipe_context *pctx,
          tc_driver_internal_flush_notify(ctx->tc);
    } else {
       fence = &batch->state->fence;
-      submit_count = batch->state->usage.submit_count;
       if (deferred && !(flags & PIPE_FLUSH_FENCE_FD) && pfence)
          deferred_fence = true;
       else
@@ -3892,7 +3890,7 @@ zink_flush(struct pipe_context *pctx,
       mfence->fence = fence;
       mfence->sem = export_sem;
       if (fence) {
-         mfence->submit_count = submit_count;
+         mfence->submit_count = zink_batch_state(fence)->usage.submit_count;
          util_dynarray_append(&fence->mfences, struct zink_tc_fence *, mfence);
       }
       if (export_sem) {