Description: stmmac: Clear variable when destroying workqueue
References:
Notes:
 carnil> Introduced in 5a5586112b929 ("net: stmmac: support FPE link partner
 carnil> hand-shaking procedure"). Vulnerable versions: 5.13-rc1.
Bugs:
upstream: released (6.8-rc7) [8af411bbba1f457c33734795f024d0ef26d0963f]
6.7-upstream-stable: released (6.7.9) [f72cf22dccc94038cbbaa1029cb575bf52e5cbc8]
6.6-upstream-stable: released (6.6.21) [699b103e48ce32d03fc86c35b37ee8ae4288c7e3]
6.1-upstream-stable: released (6.1.81) [17ccd9798fe0beda3db212cfa3ebe373f605cbd6]
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.7.9-1)
6.1-bookworm-security: released (6.1.82-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"