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do_pop_dom_node(): move dom_stack_has_parents() to assertion
All callers already checks if the stack is empty.
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@ -137,8 +137,7 @@ do_pop_dom_node(struct dom_stack *stack, struct dom_stack_state *parent)
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struct dom_stack_state *state;
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dom_stack_callback_T callback;
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assert(stack);
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if (!dom_stack_has_parents(stack)) return 0;
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assert(stack && dom_stack_has_parents(stack));
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state = get_dom_stack_top(stack);
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callback = stack->pop_callbacks[state->node->type];
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