rfkill: add missing line break

Trivial patch adding a missing line break on
rfkill_claim_show().
Signed-off-by: NFelipe Balbi <felipe.balbi@nokia.com>
Acked-by: NHenrique de Moraes Holschuh <hmh@hmh.eng.br>
Acked-by: NIvo van Doorn <IvDoorn@gmail.co>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

net/rfkill/rfkill.c

@@ -431,7 +431,7 @@ static ssize_t rfkill_claim_show(struct device *dev,
 {
 	struct rfkill *rfkill = to_rfkill(dev);
 
-	return sprintf(buf, "%d", rfkill->user_claim);
+	return sprintf(buf, "%d\n", rfkill->user_claim);
 }
 
 static ssize_t rfkill_claim_store(struct device *dev,