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[cc2-qbe] fix uninitialized haslabel in code.c

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

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

@@ -304,7 +304,7 @@

 	Symbol *p;

 	Type *tp;

 	char *sep, *name;

-	int haslabel;

+	int haslabel = 0;

 	if (curfun->kind == SGLOB)

 		fputs("export ", stdout);