IB/core: Simplify check for RoCE route resolve

roce_resolve_route_from_path() resolves the route based on the netdevice
of the GID attribute, therefore there is no point in checking again if
the route is resolved matches the same interface it arrived.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>