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Avoid initial assignment in typeconv()

This initial assignment was not needed since the result of
promote was assigned again.

--- a/expr.c

+++ b/expr.c

@@ -41,11 +41,11 @@

 typeconv(Node **p1, Node **p2)

 {

 	Type *tp1, *tp2;

-	Node *np1 = *p1, *np2 = *p2;

+	Node *np1, *np2;

 	uint8_t n;

-	np1 = promote(np1);

-	np2 = promote(np2);

+	np1 = promote(*p1);

+	np2 = promote(*p2);

 	tp1 = np1->utype;

 	tp2 = np2->utype;

-- 

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