intel: Don't consider miptrees for other texture targets to match.

We would have done a relayout at validate time, but it's senseless to
store into a miptree if it's going to force relayout.

src/mesa/drivers/dri/intel/intel_mipmap_tree.c

@@ -333,6 +333,9 @@ intel_miptree_match_image(struct intel_mipmap_tree *mt,
    GLuint level = intelImage->base.Base.Level;
    int width, height, depth;
 
+   if (target_to_target(image->TexObject->Target) != mt->target)
+      return false;
+
    if (image->TexFormat != mt->format &&
        !(image->TexFormat == MESA_FORMAT_S8_Z24 &&
 	 mt->format == MESA_FORMAT_X8_Z24 &&

src/mesa/drivers/dri/intel/intel_tex_validate.c

@@ -62,7 +62,6 @@ intel_finalize_mipmap_tree(struct intel_context *intel, GLuint unit)
     */
    if (intelObj->mt &&
        (!intel_miptree_match_image(intelObj->mt, &firstImage->base.Base) ||
-	intelObj->mt->target != intelObj->base.Target ||
 	intelObj->mt->first_level != tObj->BaseLevel ||
 	intelObj->mt->last_level < intelObj->_MaxLevel)) {
       intel_miptree_release(&intelObj->mt);