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heretic: replace shifted negative value with negative of shifted value

This fixes a "Shifting a negative value is undefined behaviour"
cppcheck error.

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

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

@@ -1006,7 +1006,7 @@

 //

 // Added for the sideviewing with an external device

     if (viewangleoffset <= 1024 << ANGLETOFINESHIFT || viewangleoffset >=

-        -1024 << ANGLETOFINESHIFT)

+        -(1024 << ANGLETOFINESHIFT))

     {                           // don't draw on side views

         R_DrawPlayerSprites();

     }