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9pex: remove unused var

--- a/9pex.c

+++ b/9pex.c

@@ -132,7 +132,7 @@

 {

 	struct timeval t;

 	fd_set r, w, e;

-	int n, fl;

+	int fl;

 	FD_ZERO(&r);

 	FD_SET(in, &r);

@@ -146,7 +146,7 @@

 	t.tv_usec = 1000;

 	for (;;) {

 		errno = 0;

-		if ((n = select(max(in, out) + 1, &r, &w, &e, block ? NULL : &t)) < 0 || FD_ISSET(in, &e) || FD_ISSET(out, &e)) {

+		if (select(max(in, out) + 1, &r, &w, &e, block ? NULL : &t) < 0 || FD_ISSET(in, &e) || FD_ISSET(out, &e)) {

 			if (errno == EINTR)

 				continue;

 			return -1;