i965: Initialize unused VUE map slots to BRW_VARYING_SLOT_PAD.

Nothing actually relies on unused slots being initialized to
BRW_VARYING_SLOT_COUNT.  Soon, we're going to have VUE maps with holes
in them, at which point pre-filling with BRW_VARYING_SLOT_PAD make a lot
more sense.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
1 file changed