8ebf76a9a9
_cogl_atlas_texture_blit_begin binds a texture to use as the destination and it expects it to stay bound until _cogl_atlas_texture_end_blit is called. However there was a call to _cogl_journal_flush directly after setting up the blit state which could cause the wrong texture to be bound. This just moves the flush to before the call to _cogl_atlas_texture_blit_begin. This was breaking test-cogl-sub-texture.