mt76: mt7615: fix some checkpatch warnings

This fixes the following checkpatch warnings:

WARNING: Improper SPDX comment style
Fix blank lines.
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c

-/* SPDX-License-Identifier: ISC */
+// SPDX-License-Identifier: ISC
 
 #include "mt7615.h"
 

drivers/net/wireless/mediatek/mt76/mt7615/mac.c

@@ -514,7 +514,6 @@ void mt7615_mac_set_rates(struct mt7615_dev *dev, struct mt7615_sta *sta,
 
 			rates[i].idx--;
 		}
-
 	}
 
 	val[0] = mt7615_mac_tx_rate_val(dev, &rates[0], stbc, &bw);
@@ -819,8 +818,9 @@ static bool mt7615_fill_txs(struct mt7615_dev *dev, struct mt7615_sta *sta,
 			sta->rate_probe = false;
 		}
 		spin_unlock_bh(&dev->mt76.lock);
-	} else
+	} else {
 		info->status.rates[0] = rs->rates[first_idx / 2];
+	}
 	info->status.rates[0].count = 0;
 
 	for (i = 0, idx = first_idx; count && idx <= last_idx; idx++) {

drivers/net/wireless/mediatek/mt76/mt7615/mcu.c

@@ -1574,5 +1574,3 @@ int mt7615_mcu_set_rx_ba(struct mt7615_dev *dev,
 	return __mt76_mcu_send_msg(&dev->mt76, MCU_EXT_CMD_WTBL_UPDATE,
 				   &wtbl_req, sizeof(wtbl_req), true);
 }
-
-