docs: def nl_msgtype_lookup(ops, msgtype):
      """Lookup message type cache association.
  
      https://github.com/thom311/libnl/blob/libnl3_2_25/lib/cache_mngt.c#L189
  
      Searches for a matching message type association ing the specified cache operations.
  
      Positional arguments:
      ops -- cache operations (nl_cache_ops class instance).
      msgtype -- Netlink message type (integer).
  
      Returns:
      A message type association or None.
      """
      for i in ops.co_msgtypes:
          if i.mt_id == msgtype:
              return i
      return None