nv50: don't assume a rast is set when validating for clears

Clears can happen before a rast is set, which can in turn cause scissors
and fragprog to be validated. Make sure that we handle this case.

Reported-by: Andrew Randrianasulu <randrianasulu@gmail.com>
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
2 files changed