CVE-2021-47479 staging: rtl8712: fix use-after-free in rtl8712_dl_fw

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8712: fix use-after-free in rtl8712dlfw Syzbot reported use-after-free in rtl8712dlfw. The problem was in race condition between r871xudevremove -ndoopen callback. It's easy to see from crash log, that driver accesses...