CVE-2026-46180 wifi: brcmfmac: Fix potential use-after-free issue when stopping watchdog task

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix potential use-after-free issue when stopping watchdog task Watchdog task might end between sendsig and kthreadstop calls, what results in the use-after-free issue. Fix this by increasing watchdog task referenc...