wl12xx: Correctly set up protection if non-GF STAs are present

Set the gf_protection bit when calling ACX_HT_BSS_OPERATION according
to the GF bit passed by mac80211 in ht_operation_mode.

[Added a proper commit message -- Luca]
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

drivers/net/wireless/wl12xx/acx.c

@@ -1361,7 +1361,8 @@ int wl1271_acx_set_ht_information(struct wl1271 *wl,
 	acx->ht_protection =
 		(u8)(ht_operation_mode & IEEE80211_HT_OP_MODE_PROTECTION);
 	acx->rifs_mode = 0;
-	acx->gf_protection = 0;
+	acx->gf_protection =
+		!!(ht_operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 	acx->ht_tx_burst_limit = 0;
 	acx->dual_cts_protection = 0;