net/ice/base: fix reference count on VSI list update

net/ice/base: fix reference count on VSI list update

The parameter ref_cnt is used for tracking how many
rules are reusing this VSI list, so it can only be
updated when a rule which using this list be deleted.

Fixes: f89aa3affa9e ("net/ice/base: support removing advanced rule")
Cc: stable@dpdk.org
Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
Signed-off-by: Paul M Stillwell Jr <paul.m.stillwell.jr@intel.com>
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Qiming Yang <qiming.yang@intel.com>