CVE-2024-42307 cifs: fix potential null pointer use in destroy_workqueue in init_cifs error path

In the Linux kernel, the following vulnerability has been resolved: cifs: fix potential null pointer use in destroyworkqueue in initcifs error path Dan Carpenter reported a Smack static checker warning: fs/smb/client/cifsfs.c:1981 initcifs error: we previously assumed 'serverclosewq' could be nul...