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vkd3d-shader/hlsl: Avoid a null pointer dereference in hlsl_block_cleanup. (UBSan)

Victor Chiletto requested to merge vitorhnn/vkd3d:null-deref-fix into master

destroy_block() is called with a NULL block from:

  • create_loop, through the loop rules for while and do-while loops.
  • The selection_statement rule, in the case $6.else_block is NULL.
  • free_parse_initializer.

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