[pull] master from ruby:master - #1381
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value_expr_check descended into the left operand of an and/or node, so a chain such as `x = (return) && (return) && a` reported the same void value once per operator instead of once. The left operand is already checked for a value when logop() builds the node, so stop at the node rather than descending. This matches the existing test_void_value_in_rhs expectation that the same warning is emitted just once, and mirrors the same change in ruby/prism#4221.
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