RDMA/cm: Respect returned status of cm_init_av_by_path

RDMA/cm: Respect returned status of cm_init_av_by_path

[ Upstream commit e54b6a3bcd1ec972b25a164bdf495d9e7120b107 ]

Add missing check for failure of cm_init_av_by_path

Fixes: e1444b5a163e ("IB/cm: Fix automatic path migration support")
Reported-by: Slava Shwartsman <slavash@mellanox.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>