enable developer warnings

configname: CONFIG_CFG80211_DEVELOPER_WARNINGS

Linux Kernel Configuration
└─>Networking support
└─>Wireless
└─>enable developer warnings
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
This option enables some additional warnings that help
cfg80211 developers and driver developers, but beware that
they can also trigger due to races with userspace.

For example, when a driver reports that it was disconnected
from the AP, but the user disconnects manually at the same
time, the warning might trigger spuriously due to races.

Say Y only if you are developing cfg80211 or a driver based
on it (or mac80211).