shithub: qk2

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fix waterline crash

pspan->v can be negative, so s_spanletvars.pz can be set to a bogus address
and crash when read.
underwater view is still broken on weird aspect ratios, but at least it doesn't
crash.

--- a/r_poly.c

+++ b/r_poly.c

@@ -592,7 +592,7 @@

 	do

 	{

 		s_spanletvars.pdest   = (byte *)d_viewbuffer + ( d_scantable[pspan->v] /*r_screenwidth * pspan->v*/) + pspan->u;

-		s_spanletvars.pz      = d_pzbuffer + (d_zwidth * pspan->v) + pspan->u;

+		s_spanletvars.pz      = d_pzbuffer + (d_zwidth * abs(pspan->v)) + pspan->u;

 		s_spanletvars.u       = pspan->u;

 		s_spanletvars.v       = pspan->v;