thunderbolt: Fix lane bonding log when bonding not possible

thunderbolt: Fix lane bonding log when bonding not possible

Currently if lane bonding is not possible or not supported, we continue
and read the updated number of Total Buffers from lane adapters unnecessarily
and incorrectly log the bonding as successful.

Fix this by bailing out early when bonding is not possible, avoiding
the unnecessary read and the misleading log message.

Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>