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wifi: fix %.*s format in wifictl

--- a/sys/src/9/port/wifi.c

+++ b/sys/src/9/port/wifi.c

@@ -921,7 +921,7 @@

 		return;

 	if(waserror())

 		return;

-	n = snprint(buf, sizeof(buf), "%.*s %q", (int)(p - opt), opt, p+1);

+	n = snprint(buf, sizeof(buf), "%.*s %q", utfnlen(opt, p - opt), opt, p+1);

 	wifictl(wifi, buf, n);

 	poperror();

 }

@@ -972,7 +972,7 @@

 		nexterror();

 	}

 	if(wifi->debug)

-		print("#l%d: wifictl: %.*s\n", wifi->ether->ctlrno, (int)n, buf);

+		print("#l%d: wifictl: %.*s\n", wifi->ether->ctlrno, utfnlen(buf, n), buf);

 	memmove(addr, wifi->ether->bcast, Eaddrlen);

 	wn = wifi->bss;

 	cb = parsecmd(buf, n);

-- 

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