zink: remove zink_batch_state::descs_used

this is no longer used or needed

Reviewed-by: Dave Airlie <airlied@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11400>

src/gallium/drivers/zink/zink_batch.c

@@ -82,7 +82,6 @@ zink_reset_batch_state(struct zink_context *ctx, struct zink_batch_state *bs)
 
    bs->flush_res = NULL;
 
-   bs->descs_used = 0;
    ctx->resource_size -= bs->resource_size;
    bs->resource_size = 0;
 

src/gallium/drivers/zink/zink_batch.h

@@ -69,8 +69,6 @@ struct zink_batch_state {
 
    struct zink_resource *flush_res;
 
-   unsigned short descs_used; //number of descriptors currently allocated
-
    struct set *fbs;
    struct set *programs;
 

src/gallium/drivers/zink/zink_descriptors.c

@@ -813,9 +813,7 @@ out:
    _mesa_hash_table_insert_pre_hashed(pool->desc_sets, hash, &zds->key, zds);
 quick_out:
    zds->punted = zds->invalid = false;
-   if (batch_add_desc_set(batch, zds)) {
-      batch->state->descs_used += pool->key.layout->num_descriptors;
-   }
+   batch_add_desc_set(batch, zds);
    if (push_set)
       ctx->dd->last_set[is_compute] = zds;
    else