wifi: mt76: mt7996: Add NULL check in mt7996_thermal_init

devm_kasprintf() can return a NULL pointer on failure,but this
returned value in mt7996_thermal_init() is not checked.
Add NULL check in mt7996_thermal_init(), to handle kernel NULL
pointer dereference error.

Fixes: 69d54ce ("wifi: mt76: mt7996: switch to single multi-radio wiphy")
Signed-off-by: Charles Han <hanchunchao@inspur.com>
Link: https://patch.msgid.link/20250407095551.32127-1-hanchunchao@inspur.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>

Author: Charles Han

drivers/net/wireless/mediatek/mt76/mt7996/init.c

@@ -217,6 +217,9 @@ static int mt7996_thermal_init(struct mt7996_phy *phy)
 
 	name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7996_%s.%d",
 			      wiphy_name(wiphy), phy->mt76->band_idx);
+	if (!name)
+		return -ENOMEM;
+
 	snprintf(cname, sizeof(cname), "cooling_device%d", phy->mt76->band_idx);
 
 	cdev = thermal_cooling_device_register(name, phy, &mt7996_thermal_ops);