staging: rtl8192u: remove break after return

Remove "break" statement after a "return" statement as
it does not get executed.

Found by checkpatch.pl - break is not useful after a goto
or return
Signed-off-by: Supriya Karanth <iskaranth@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c

@@ -2115,7 +2115,6 @@ ieee80211_rx_frame_softmac(struct ieee80211_device *ieee, struct sk_buff *skb,
 		break;
 	default:
 		return -1;
-		break;
 	}
 
 	//dev_kfree_skb_any(skb);