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This commit fixes the nl80211 driver call get_inact_sec() to return -1 when STA inactivity time retrieval fails in i802_read_sta_data(). This was intended to be handled by initalizing the inactive_msec member to -1 but i802_read_sta_data() assumes the data parameter is uninitialized and memsets the entire structure, neutralizing the attempt to distinguish between no value (-1) and a time value of 0. This is fixed by now requiring i802_read_sta_data() callers to initialize the data structure first (allowing get_inact_sec() to use -1). This is a safe change because it does not change any driver API behavior and only affects one other static function in driver_nl80211.c Signed-off-by: Joel Cunningham <joel.cunningham@me.com>