wifi: mt76: mt7925: Fix null-ptr-deref in mt7925_thermal_init()

devm_kasprintf() returns NULL on error. Currently, mt7925_thermal_init()
does not check for this case, which results in a NULL pointer
dereference.

Add NULL check after devm_kasprintf() to prevent this issue.

Fixes: 396e41a74a88 ("wifi: mt76: mt7925: support temperature sensor")
Signed-off-by: Henry Martin <[e-mail]>
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Felix Fietkau <[e-mail]>

drivers/net/wireless/mediatek/mt76/mt7925/init.c

···
 
 	name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7925_%s",
 			      wiphy_name(wiphy));
+	if (!name)
+		return -ENOMEM;
 
 	hwmon = devm_hwmon_device_register_with_groups(&wiphy->dev, name, phy,
 						       mt7925_hwmon_groups);