From Jouni Malinen via https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6359

From Jouni Malinen via https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6359
IEEE 802.11 dissector shows duplicated proto item for Action category

Action frame dissecting is first adding hf_ieee80211_action (wlan_mgt.fixed.action) field before the category-based processing. Immediately after that, the per-category implementations are adding FIELD_CATEGORY_CODE (hf_ieee80211_ff_category_code, i.e., wlan_mgt.fixed.category_code) to the proto tree for the exact same octet. Remove hf_ieee80211_action to avoid the duplicated item in the tree. In addition, remove the now unused action_item and action_tree variables.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@39169 f5534014-38df-0310-8fa8-9805f1628bb7