CVE-2025-38541 wifi: mt76: mt7925: Fix null-ptr-deref in mt7925_thermal_init()

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7925: Fix null-ptr-deref in mt7925thermalinit devmkasprintf returns NULL on error. Currently, mt7925thermalinit does not check for this case, which results in a NULL pointer dereference. Add NULL check after...