draw: (trivial) fix clamping of viewport index
The old logic would let all negative values go through unclamped, with potentially disastrous results (probably trying to fetch viewport values from random memory locations). GL has undefined rendering for vp indices outside valid range but that's a bit too undefined... (The logic is now the same as in llvmpipe.) CC: "10.1 10.2" <mesa-stable@lists.freedesktop.org> Reviewed-by:Jose Fonseca <jfonseca@vmware.com> Reviewed-by:
Ilia Mirkin <imirkin@alum.mit.edu> Tested-by:
Ilia Mirkin <imirkin@alum.mit.edu> (cherry picked from commit 604e54de)
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