topic: wrap revbranchcache._branchinfo() too This method can be used as a direct replacement for branchinfo() if on-disk cache cannot be read, so we need to wrap it as well. However, branchinfo() can call _branchinfo(), so we need to make sure that we do the branch-to-FQBN conversion only once. For this, we check if revbranchcache.branchinfo is actually _branchinfo.