st/mesa: fix potential use-after-free in draw_bitmap_quad

st/mesa: fix potential use-after-free in draw_bitmap_quad

This is super unlikely to be freed before use, but let's fix it anyway.

setup_render_state calls set_sampler_views(take_ownership=true), which
means it takes ownership of the sampler view reference and is free to
unreference it, so we can't use sv after setup_render_state.

Fixes: feda6e9c5d101 - st/mesa: set take_ownership = true in set_sampler_views

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17780>