mt76: mt7915: set fops_sta_stats.owner to THIS_MODULE

If THIS_MODULE is not set, the module would be removed while debugfs is
being used.
It eventually makes kernel panic.

Fixes: ec9742a8 ("mt76: mt7915: add .sta_add_debugfs support")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -460,6 +460,7 @@ static const struct file_operations fops_sta_stats = {
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = single_release,
+	.owner = THIS_MODULE,
 };
 
 void mt7915_sta_add_debugfs(struct ieee80211_hw *hw, struct ieee80211_vif *vif,