Merge branch 'bugfix/fix_several_wifi_misc_issues' into 'master'

esp32: fix several misc wifi issue

1. Fix ssid_str not free issue
2. Fix sniffer not work issue
3. Fix null parameter cause esp_wifi_init crash issue
4. Enable ap ampdu rx interface

See merge request !484
This commit is contained in:
Jiang Jiang Jian
2017-02-07 11:15:58 +08:00