st/mesa: restore original last_layer comparison
Commit e648d4a1d1c0c5f70916e38366b863f0bec79a62 changed the original
less-than test to a not-equal test. This was an effort to save some
memory by switching the texture layout to a non-mipmapped layout when
we mis-guessed about the original layout (thus saving some memory).
However, this causes us to hit a new (apparently broken) code path
when copying the old texture's data to the new texture. Simply
undo this change for the time being until the other/new bug is fixed.
Fixes fd.o bug 27933.
1 file changed