FIX: [wext] do not show INT_MIN as txpower value if nothing was configured

BugzId: 72713

recipes-kernel/mac80211/mac80211/0009-netmodule-patches.patch

@@ -649,3 +649,17 @@ index b6caa2b..fbe581a 100644
  }
  
  static void handle_band_custom(struct wiphy *wiphy,
+diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
+index 78f2927..4fa5b0d 100644
+--- a/net/wireless/wext-compat.c
++++ b/net/wireless/wext-compat.c
+@@ -895,7 +895,8 @@ static int cfg80211_wext_giwtxpower(struct net_device *dev,
+ 	/* well... oh well */
+ 	data->txpower.fixed = 1;
+ 	data->txpower.disabled = rfkill_blocked(rdev->rfkill);
+-	data->txpower.value = val;
++    /* show same behavior as iw and show txpower 0dBm if not initialized */
++	data->txpower.value = val == INT_MIN ? 0 : val;
+ 	data->txpower.flags = IW_TXPOW_DBM;
+ 
+ 	return 0;