acme.c: Initialize struct ibv_path_record path variable

show_path function use uninitialized value for:

path.flowlabel_hoplimit
path.mtu
path.packetlifetime
path.pkey
path.qosclass_sl

Signed-off-by: Sasha Kotchubievsky <sashakot@mellanox.com>
Signed-off-by: Hal Rosenstock <hal@mellanox.com>