iwl4965: Fix more memory leaks in __il4965_up()

In some of the non-success return paths, the memory allocated by
iwl4965_sta_alloc_lq() in iwl4965_alloc_bcast_station() is not freed.

In particular:
 - if the card isn't ready after il4965_prepare_card_hw()
 - if the card is hardware-rfkilled

In the hardware rfkilled path, the driver enables the rfkill
interrupt. When the card is unrfkilled and this interrupt is raised
we end up calling il4965_bg_restart() which calls __il4965_up() which
calls iwl4965_alloc_bcast_station() again.
Suggested-by: NJia-Ju Bai <baijiaju1990@163.com>
Signed-off-by: NJulian Calaby <julian.calaby@gmail.com>
Acked-by: NStanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/intel/iwlegacy/4965-mac.c

@@ -5553,6 +5553,7 @@ __il4965_up(struct il_priv *il)
 
 	il4965_prepare_card_hw(il);
 	if (!il->hw_ready) {
+		il_dealloc_bcast_stations(il);
 		IL_ERR("HW not ready\n");
 		return -EIO;
 	}
@@ -5564,6 +5565,7 @@ __il4965_up(struct il_priv *il)
 		set_bit(S_RFKILL, &il->status);
 		wiphy_rfkill_set_hw_state(il->hw->wiphy, true);
 
+		il_dealloc_bcast_stations(il);
 		il_enable_rfkill_int(il);
 		IL_WARN("Radio disabled by HW RF Kill switch\n");
 		return 0;