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Remove duplicated code in postfix

These new order in the switch removes the needed
for a function call.

--- a/expr.c

+++ b/expr.c

@@ -67,13 +67,12 @@

 		case DEC:   op = OPOSTDEC; goto next;

 		default:    return np1;

 		}

-	node_2_childs:

-		np1 = node(op, np1, np2);

-		continue;

 	expect_iden:

 		next();

 		expect(IDEN);

-		np1 = node(op, np1, nodesym(lookup(yytext, NS_IDEN)));

+		np2 = nodesym(lookup(yytext, NS_IDEN));

+	node_2_childs:

+		np1 = node(op, np1, np2);

 		continue;

 	next:

 		np1 = node(op, np1, NULL);