To avoid wild pointer, pointers should be set to NULL after free them.
Fixes: 1a2fc1799f ("net/ice: reject duplicated flow for flow director")
Fixes: 84dc7a95a2 ("net/ice: enable flow director engine")
Fixes: 0f880c3df1 ("net/ice: add flow director counter resource init/release")
Signed-off-by: Shougang Wang <shougangx.wang@intel.com>
Acked-by: Qiming Yang <qiming.yang@intel.com>
Acked-by: Xiaolong Ye <xiaolong.ye@intel.com>