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9gc: remove useless assignment

--- a/9gc.c

+++ b/9gc.c

@@ -356,7 +356,7 @@

 	t.tv_sec = 10;

 	for (;;) {

 		errno = 0;

-		if ((n = select(a->f + 1, &r, NULL, &e, &t)) < 0 || FD_ISSET(a->f, &e) || FD_ISSET(0, &e)) {

+		if (select(a->f + 1, &r, NULL, &e, &t) < 0 || FD_ISSET(a->f, &e) || FD_ISSET(0, &e)) {

 			if (errno == EINTR)

 				continue;

 			return -1;