st/mesa: fix sampler view leak in st_DrawAtlasBitmaps()

st/mesa: fix sampler view leak in st_DrawAtlasBitmaps()

I neglected to free the sampler view which was created earlier in the
function.  So for each glCallLists() command that used the bitmap atlas
to draw text, we'd leak a sampler view object.

Also, check for st_create_texture_sampler_view() failure and record
GL_OUT_OF_MEMORY.

Cc: "11.1 11.2" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Charmaine Lee <charmainel@vmware.com>