CVE-2022-49195 net: dsa: fix panic on shutdown if multi-chip tree failed to probe

In the Linux kernel, the following vulnerability has been resolved: net: dsa: fix panic on shutdown if multi-chip tree failed to probe DSA probing is atypical because a tree of devices must probe all at once, so out of N switches which call dsatreesetuproutingtable during probe, for N - 1 of them...