Fix setting PT_IBQP type

Without this patch, pinfo->ptype is PT_UNKNOWN

Change-Id: Ia15b5115f874d0c9ff69be11ed7ee3dac1fadbd5
Signed-off-by: Yan Burman <yanb@mellanox.com>
Reviewed-on: https://code.wireshark.org/review/2941
Reviewed-by: Anders Broman <a.broman58@gmail.com>