st/bitmap: release the temporary bitmap sampler view

st_cb_bitmap appends a temporary bitmap sampler view to the sampler
view array passed to set_sampler_views().

1a5c660ef5 changed this path to only release the extra YUV views
returned by st_get_sampler_views(), but the temporary bitmap view is
created locally and is not part of extra_sampler_views. It therefore
stopped being released so release the temporary bitmap sampler view
explicitly after drawing the bitmap quad.

Fixes: 1a5c660ef5 ("st/bitmap: only release YUV samplerviews")
(cherry picked from commit 33864e569e)

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40979>

.pick_status.json

@@ -4974,7 +4974,7 @@
         "description": "st/bitmap: release the temporary bitmap sampler view",
         "nominated": true,
         "nomination_type": 2,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "1a5c660ef5b881d4193566a777b150ef912a4f9a",
         "notes": null

src/mesa/state_tracker/st_cb_bitmap.c

@@ -468,6 +468,7 @@ st_flush_bitmap_cache(struct st_context *st)
                           cache->fp,
                           cache->scissor_enabled,
                           cache->clamp_frag_color);
+         pipe->sampler_view_release(pipe, sv);
       }
 
       /* release/free the texture */