wifi: mt76: mt7921: Check devm_kasprintf() returned value

BugLink: https://bugs.launchpad.net/bugs/2089340

commit 1ccc9e476ce76e8577ba4fdbd1f63cb3e3499d38 upstream.

devm_kasprintf() can return a NULL pointer on failure but this returned
value is not checked. Fix this lack and check the returned value.

Found by code review.

Cc: stable@vger.kernel.org
Fixes: 6ae39b7c7e ("wifi: mt76: mt7921: Support temp sensor")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Reviwed-by: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://patch.msgid.link/20240903014455.4144536-1-make24@iscas.ac.cn
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Portia Stephens <portia.stephens@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

drivers/net/wireless/mediatek/mt76/mt7921/init.c

@@ -52,6 +52,8 @@ static int mt7921_thermal_init(struct mt792x_phy *phy)
 
 	name = devm_kasprintf(&wiphy->dev, GFP_KERNEL, "mt7921_%s",
 			      wiphy_name(wiphy));
+	if (!name)
+		return -ENOMEM;
 
 	hwmon = devm_hwmon_device_register_with_groups(&wiphy->dev, name, phy,
 						       mt7921_hwmon_groups);