ar9170: wrong test on outlen in ar9170_usb_exec_cmd() ?

remove redundant test: outlen is unsigned

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Acked-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ar9170/usb.c b/drivers/net/wireless/ath/ar9170/usb.c
index 368fc2d..d7b562d 100644
--- a/drivers/net/wireless/ath/ar9170/usb.c
+++ b/drivers/net/wireless/ath/ar9170/usb.c
@@ -350,7 +350,7 @@
 		goto err_unbuf;
 	}
 
-	if (outlen >= 0 && aru->readlen != outlen) {
+	if (aru->readlen != outlen) {
 		err = -EMSGSIZE;
 		goto err_unbuf;
 	}