mt76: mt7915: limit firmware log message printk to buffer length

Avoid including garbage from previous rx data
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/mcu.c

@@ -521,7 +521,8 @@ mt7915_mcu_rx_log_message(struct mt7915_dev *dev, struct sk_buff *skb)
 		break;
 	}
 
-	wiphy_info(mt76_hw(dev)->wiphy, "%s: %s", type, data);
+	wiphy_info(mt76_hw(dev)->wiphy, "%s: %*s", type,
+		   (int)(skb->len - sizeof(*rxd)), data);
 }
 
 static void