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doom: exit with a proper VPO in R_CheckPlane()

Fixes #48, thanks @mfrancis95 and @AXDOOMER

--- a/src/doom/r_plane.c

+++ b/src/doom/r_plane.c

@@ -307,6 +307,9 @@

     lastvisplane->picnum = pl->picnum;

     lastvisplane->lightlevel = pl->lightlevel;

+    if (lastvisplane - visplanes == MAXVISPLANES)

+	I_Error ("R_CheckPlane: no more visplanes");

+

     pl = lastvisplane++;

     pl->minx = start;

     pl->maxx = stop;