hostapd: wait longer for inactive client probe (empty data frame)

One second is not enough for some devices to ackowledge null data frame
which is sent at the end of ap_max_inactivity interval. In particular,
this causes severe Wi-Fi instability with Apple iPhone which may take
up to 3 seconds to respond.

Signed-off-by: Dmitry Ivanov <dima@ubnt.com>

SVN-Revision: 47149

package/network/services/hostapd/patches/470-wait-for-nullfunc-longer.patch

@@ -0,0 +1,11 @@
+--- a/src/ap/sta_info.h
++++ b/src/ap/sta_info.h
+@@ -179,7 +179,7 @@ struct sta_info {
+  * AP_DISASSOC_DELAY seconds. Similarly, the station will be deauthenticated
+  * after AP_DEAUTH_DELAY seconds has passed after disassociation. */
+ #define AP_MAX_INACTIVITY (5 * 60)
+-#define AP_DISASSOC_DELAY (1)
++#define AP_DISASSOC_DELAY (3)
+ #define AP_DEAUTH_DELAY (1)
+ /* Number of seconds to keep STA entry with Authenticated flag after it has
+  * been disassociated. */