qcacmn: remove reference of self_ast_entry in peer while deleting it

Reset the self_ast_entry in peer to NULL when self_ast_entry is deleted
to avoid use after free or double free conditions

Change-Id: Ic1779e35cbd98ddc0333808152e4c388449a45af
CRs-fixed: 2321768

dp/wifi3.0/dp_peer.c

@@ -628,6 +628,10 @@ void dp_peer_del_ast(struct dp_soc *soc, struct dp_ast_entry *ast_entry)
 	} else {
 		soc->ast_table[ast_entry->ast_idx] = NULL;
 		TAILQ_REMOVE(&peer->ast_entry_list, ast_entry, ase_list_elem);
+
+		if (ast_entry == peer->self_ast_entry)
+			peer->self_ast_entry = NULL;
+
 		DP_STATS_INC(soc, ast.deleted, 1);
 		dp_peer_ast_hash_remove(soc, ast_entry);
 		qdf_mem_free(ast_entry);