llvmpipe/cs: update compute counters not fragment shader.

This was updating the wrong counters.

Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Fixes: a6f6ca37c8 ("llvmpipe: add initial shader create/bind/destroy variants framework.")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6339>

src/gallium/drivers/llvmpipe/lp_state_cs.c

@@ -509,8 +509,8 @@ llvmpipe_remove_cs_shader_variant(struct llvmpipe_context *lp,
 
    /* remove from context's list */
    remove_from_list(&variant->list_item_global);
-   lp->nr_fs_variants--;
-   lp->nr_fs_instrs -= variant->nr_instrs;
+   lp->nr_cs_variants--;
+   lp->nr_cs_instrs -= variant->nr_instrs;
 
    FREE(variant);
 }