qcacld-3.0: Release serialization cmd when get peer null

In P2P connect process, GO and GC send deauth/disassoc at the
end of WPS. GO send disassoc and free station info. GO receive
deauth from GC, and send cmd WLAN_SER_CMD_GET_DISCONNECT_STATS
to get disconnect stats.

If GO send deauth and free peer info before receive deauth
from GC. Wlan_objmgr_get_peer return null, and peer is null.
Cmd of WLAN_SER_CMD_GET_DISCONNECT_STATS will never be
released since get_peer_rssi_cb will never be called.
And cmd will timeout, which is not expected.

If we call get_peer_rssi_cb without check, cmd will release.
Also csr_get_peer_rssi_cb will check peer is null or not.

Change-Id: I10b496526e259711a4dd7a91b7388ac79bb54fef
CRs-Fixed: 3119513

components/cp_stats/dispatcher/src/wlan_cp_stats_mc_tgt_api.c

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2018-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2021 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -305,8 +305,7 @@ tgt_mc_cp_stats_prepare_raw_peer_rssi(struct wlan_objmgr_psoc *psoc,
 	}
 
 end:
-	if (ev.peer_stats)
-		get_peer_rssi_cb(&ev, last_req->cookie);
+	get_peer_rssi_cb(&ev, last_req->cookie);
 
 	ucfg_mc_cp_stats_free_stats_resources(&ev);