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[cc2-qbe] move the call to setlabel() to cgen()

Cgen() is the function called to generate the asm code
for a C statement, and it means that it will receive the node
which has the label.

--- a/cc2/arch/qbe/cgen.c

+++ b/cc2/arch/qbe/cgen.c

@@ -241,7 +241,6 @@

 	char *tbl;

 	Symbol *true, *false;

-	setlabel(np->label);

 	tp = &np->type;

 	switch (np->op) {

@@ -323,6 +322,7 @@

 	Node n, *aux, *next, *ifyes, *ifno;

 	Symbol *label1, *label2;

+	setlabel(np->label);

 	switch (np->op) {

 	case OJMP:

 		ifyes = label2node(np->u.sym);