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Merge pull request #1240 from turol/fix-uninit

Fix use of uninitialized memory in heretic and hexen

--- a/src/heretic/r_things.c

+++ b/src/heretic/r_things.c

@@ -713,6 +713,7 @@

     vis = &avis;

     vis->mobjflags = 0;

     vis->psprite = true;

+    vis->footclip = 0;

     vis->texturemid =

         (BASEYCENTER << FRACBITS) + FRACUNIT / 2 - (psp->sy -

                                                     spritetopoffset[lump]);

--- a/src/hexen/r_things.c

+++ b/src/hexen/r_things.c

@@ -727,6 +727,7 @@

     vis->mobjflags = 0;

     vis->class = 0;

     vis->psprite = true;

+    vis->floorclip = 0;

     vis->texturemid = (BASEYCENTER << FRACBITS) + FRACUNIT / 2

         - (psp->sy - spritetopoffset[lump]);

     if (viewheight == SCREENHEIGHT)