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Simplify bitlogic()

Due to the last changes of typeconv() this function can be
simplified.

--- a/expr.c

+++ b/expr.c

@@ -62,13 +62,9 @@

 static Node *

 bitlogic(char op, Node *np1, Node *np2)

 {

-	np1 = promote(np1);

-	np2 = promote(np2);

-

 	if (np1->typeop != INT || np2->typeop != INT)

 		error("No integer operand in bit logical operation");

-	if (np1->utype != np2->utype)

-		typeconv(&np1, &np2);

+	typeconv(&np1, &np2);

 	return bincode(op, np1->type, np1, np2);

 }