wl12xx: don't remove key if hlid was already deleted

If hlid was already removed, there is no need to remove
its key (it might cause a fw crash, as the key is invalid).
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

drivers/net/wireless/wl12xx/cmd.c

@@ -1203,6 +1203,10 @@ int wl1271_cmd_set_sta_key(struct wl1271 *wl, u16 action, u8 id, u8 key_type,
 	struct wl1271_cmd_set_keys *cmd;
 	int ret = 0;
 
+	/* hlid might have already been deleted */
+	if (wl->sta_hlid == WL12XX_INVALID_LINK_ID)
+		return 0;
+
 	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
 	if (!cmd) {
 		ret = -ENOMEM;