r600g: update num_dw in scissor_enable workaround

"r600g: apply disable workaround on all scissors" forgot to update
num_dw, fix it.

Fixes: fbb423b433 "r600g: apply disable workaround on all scissors"
Reported-and-tested-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
1 file changed