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iostats: dont sysfatal on 9p read error due to program termination

the note mechanism is racy and can lead to the fs terminating
iostats because it gets "i/o on hugup channel" (namespace closed).

--- a/sys/src/cmd/iostats/iostats.c

+++ b/sys/src/cmd/iostats/iostats.c

@@ -166,10 +166,8 @@

 		while((n = read9pmsg(p[1], r->buf, sizeof(r->buf))) == 0 && !done)

 			;

-		if(done)

+		if(done || n < 0)

 			break;

-		if(n < 0)

-			fatal("read server");

 		if(convM2S(r->buf, n, &r->work) == 0)

 			fatal("format error");