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[cc2-qbe] fix eval call with NULL in oreturn

Actually pass the resulting token to eval instead of trying to parse
it again an having a null pointer.

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -329,9 +329,8 @@

 {

 	Node *np = newnode(u.op);

-	token = strtok(NULL, "\t\n");

-	if (token)

-		eval(strtok(NULL, "\t\n"));

+	if (token = strtok(NULL, "\t\n"))

+		eval(token);

 	if (!empty())

 		np->left = pop();

 	push(np);