mt76: mt7915: remove dead code in mt7915_get_et_stats

Remove phy check in mt7915_get_et_stats since hw is received from mac80211
and it can't be NULL

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>

mt7915/main.c

@@ -1241,11 +1241,7 @@ void mt7915_get_et_stats(struct ieee80211_hw *hw,
 
 	/* See mt7915_ampdu_stat_read_phy, etc */
 	bool ext_phy = phy != &dev->phy;
-	int i, n;
-	int ei = 0;
-
-	if (!phy)
-		return;
+	int i, n, ei = 0;
 
 	data[ei++] = mib->tx_ampdu_cnt;
 	data[ei++] = mib->tx_stop_q_empty_cnt;