qcacld-3.0: Add null peer check before releasing the peer

Currently in driver, for non-DBS hw mode, null peer is released in the
function ndi_remove_and_update_primary_connection. This causes null
pointer deferencing.

To fix this, add null peer check before releasing the peer.

CRs-Fixed: 3184390
Change-Id: Ia895c8487082e0fac6e7df63d3694fa3e152b355

components/nan/core/src/nan_main.c

@@ -465,7 +465,9 @@ ndi_remove_and_update_primary_connection(struct wlan_objmgr_psoc *psoc,
 		policy_mgr_check_n_start_opportunistic_timer(psoc);
 	}
 
-	wlan_objmgr_peer_release_ref(peer, WLAN_NAN_ID);
+	if (peer)
+		wlan_objmgr_peer_release_ref(peer, WLAN_NAN_ID);
+
 	return QDF_STATUS_SUCCESS;
 }