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[cc2]Fix segmentation fault in writeout function

This patch fixes a segfault when more than one function is
defined in the IR input.

--- a/cc2/node.c

+++ b/cc2/node.c

@@ -69,7 +69,7 @@

 	struct arena *ap, *next;

 	for (ap = arena; ap; ap = next) {

-		next = ap;

+		next = ap->next;

 		free(ap->mem);

 		free(ap);

 	}

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -629,6 +629,7 @@

 	cleannodes();  /* remove code of previous function */

 	popctx();  /* remove context of previous function */

 	curfun = NULL;

+	endf = 0;

 	while (!endf && nextline())

 		/* nothing */;

-- 

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