st/mesa: fix incorrect texture size allocation in st_finalize_texture()

If finalizing a non-POW mipmapped texture with an odd-sized base texture
image we were allocating the wrong size of gallium texture (off by one).
Need to be more careful about computing the base texture image size.

This fixes https://bugs.freedesktop.org/show_bug.cgi?id=34463

src/mesa/state_tracker/st_cb_texture.c

@@ -1746,9 +1746,24 @@ st_finalize_texture(struct gl_context *ctx,
 
    /* Find gallium format for the Mesa texture */
    firstImageFormat = st_mesa_format_to_pipe_format(firstImage->base.TexFormat);
-   st_gl_texture_dims_to_pipe_dims(stObj->base.Target, stObj->width0,
-                                   stObj->height0, stObj->depth0,
-                                   &ptWidth, &ptHeight, &ptDepth, &ptLayers);
+
+   /* Find size of level=0 Gallium mipmap image, plus number of texture layers */
+   {
+      GLuint width, height, depth;
+      if (!guess_base_level_size(stObj->base.Target,
+                                 firstImage->base.Width2,
+                                 firstImage->base.Height2,
+                                 firstImage->base.Depth2,
+                                 stObj->base.BaseLevel,
+                                 &width, &height, &depth)) {
+         width = stObj->width0;
+         height = stObj->height0;
+         depth = stObj->depth0;
+      }
+      /* convert GL dims to Gallium dims */
+      st_gl_texture_dims_to_pipe_dims(stObj->base.Target, width, height, depth,
+                                      &ptWidth, &ptHeight, &ptDepth, &ptLayers);
+   }
 
    /* If we already have a gallium texture, check that it matches the texture
     * object's format, target, size, num_levels, etc.