Fix misplaced #endif in functional.hlsl

Author: kevyuu

include/nbl/builtin/hlsl/functional.hlsl

@@ -482,10 +482,7 @@ struct NAME<T NBL_PARTIAL_REQ_BOT(concepts::Scalar<T> || concepts::Vector<T> ||
 NBL_UNARY_OP_SPECIALIZATION(bit_not, ~)
 NBL_UNARY_OP_SPECIALIZATION(negate, -)
 
-
-
-#endif
 } //namespace nbl
 } //namespace hlsl
 
-#endif
+#endif