st/mesa: release sampler views when redefining a texture in st_context_teximage

Noticed randomly.

Cc: 17.2 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/mesa/state_tracker/st_manager.c

@@ -48,6 +48,7 @@
 #include "st_cb_fbo.h"
 #include "st_cb_flush.h"
 #include "st_manager.h"
+#include "st_sampler_view.h"
 
 #include "state_tracker/st_gl_api.h"
 
@@ -735,6 +736,7 @@ st_context_teximage(struct st_context_iface *stctxi,
    pipe_resource_reference(&stImage->pt, tex);
    stObj->surface_format = pipe_format;
 
+   st_texture_release_all_sampler_views(st, stObj);
    stObj->needs_validation = true;
 
    _mesa_dirty_texobj(ctx, texObj);