Fix error freeing null pointer on exit for debug builds

Changing comments to 'if 0' in [0] somehow caused null pointer
dereference on exit. Replace 'if 0' with C++ style comments to resolve.

[0]: 7b87c160f8

source/blender/draw/engines/eevee_next/shaders/eevee_shadow_debug_frag.glsl

@@ -37,11 +37,10 @@ vec3 debug_random_color(int v)
 void debug_tile_print(ShadowTileData tile, ivec4 tile_coord)
 {
   /* This `printf` injection is based on string literal detection. Comment it out unless needed. */
-#if 0
-  printf("Tile (%u, %u) in Tilemap %u: page(%u, %u, %u), cache_index %u",
-         tile_coord.x, tile_coord.y, tile_coord.z, tile.page.x, tile.page.y, tile.page.z,
-         tile.cache_index);
-#endif
+  /* NOTE: using `#if 0` here causes a crash on exit for debug builds, stick to C++ comments. */
+  // printf("Tile (%u, %u) in Tilemap %u: page(%u, %u, %u), cache_index %u",
+  // tile_coord.x, tile_coord.y, tile_coord.z, tile.page.x, tile.page.y, tile.page.z,
+  // tile.cache_index);
 }
 
 vec3 debug_tile_state_color(ShadowTileData tile)