mlxsw: spectrum_router: Fix possible neighbour reference count leak

mlxsw: spectrum_router: Fix possible neighbour reference count leak

mlxsw_sp_router_schedule_work() takes a reference on a neighbour,
expecting a work item to release it later on. However, we might fail to
schedule the work item, in which case the neighbour reference count will
be leaked.

Fix by taking the reference just before scheduling the work item. Note
that mlxsw_sp_router_schedule_work() can receive a NULL neighbour
pointer, but neigh_clone() handles that correctly.

Spotted during code review, did not actually observe the reference count
leak.

Fixes: 151b89f6025a ("mlxsw: spectrum_router: Reuse work neighbor initialization in work scheduler")
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/ec2934ae4aca187a8d8c9329a08ce93cca411378.1764695650.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>