meta: Don't bind the created texture object in init_temp_texture().

meta: Don't bind the created texture object in init_temp_texture().

This function is executed outside _mesa_meta_begin/end(), that means
that e.g. _mesa_meta_Bitmap() clobbers the texturing state because it
changes the currently active texture object.

There's no need to bind the new texture when it's created, it's done
again later anyway (from setup_drawpix/copypix_texture()).

Signed-off-by: Brian Paul <brianp@vmware.com>