CVE-2022-49805 net: lan966x: Fix potential null-ptr-deref in lan966x_stats_init()

In the Linux kernel, the following vulnerability has been resolved: net: lan966x: Fix potential null-ptr-deref in lan966xstatsinit lan966xstatsinit calls createsinglethreadworkqueue and not checked the ret value, which may return NULL. And a null-ptr-deref may happen: lan966xstatsinit...