net: tipc: prepare attrs in __tipc_nl_compat_dumpit()

net: tipc: prepare attrs in __tipc_nl_compat_dumpit()

__tipc_nl_compat_dumpit() calls tipc_nl_publ_dump() which expects
the attrs to be available by genl_dumpit_info(cb)->attrs. Add info
struct and attr parsing in compat dumpit function.

Reported-by: [email protected]
Fixes: 057af7071344 ("net: tipc: have genetlink code to parse the attrs during dumpit")
Signed-off-by: Jiri Pirko <[email protected]>
Acked-by: Jon Maloy <[email protected]>
Signed-off-by: Jakub Kicinski <[email protected]>