Fix wrong "void value expression" error

* parse.y (value_expr_check): `then` or `else` only `if` is not a
  void value expression, as the counterpart is evaluated as `nil`.
  [Bug #15932]

1 files changed, 2 insertions, 4 deletions

diff --git a/parse.y b/parse.y
index eb00b7ce3a..b966a0abc9 100644
--- a/parse.y
+++ b/parse.y
@@ -10552,12 +10552,10 @@ value_expr_check(struct parser_params *p, NODE *node)
 	  case NODE_IF:
 	  case NODE_UNLESS:
 	    if (!node->nd_body) {
-		node = node->nd_else;
-		break;
+		return NULL;
 	    }
 	    else if (!node->nd_else) {
-		node = node->nd_body;
-		break;
+		return NULL;
 	    }
 	    vn = value_expr_check(p, node->nd_body);
 	    if (!vn) return NULL;