qcacmn: Free memory only if it is allocated

peer attach failed due to memory allocation failure
which triggered soc restart, as part of soc restart
peer detach tried to free AST hash table and entries
which was not allocated.

For peer hash table and AST hash table free only if
the memory is allocated

CRs-Fixed: 2425963
Change-Id: Ib7a624c91f544f1a8da2b96b4d342a13b9f3b162

dp/wifi3.0/dp_peer.c

@@ -177,7 +177,10 @@ static int dp_peer_find_hash_attach(struct dp_soc *soc)
 
 static void dp_peer_find_hash_detach(struct dp_soc *soc)
 {
-	qdf_mem_free(soc->peer_hash.bins);
+	if (soc->peer_hash.bins) {
+		qdf_mem_free(soc->peer_hash.bins);
+		soc->peer_hash.bins = NULL;
+	}
 }
 
 static inline unsigned dp_peer_find_hash_index(struct dp_soc *soc,
@@ -289,6 +292,9 @@ static void dp_peer_ast_hash_detach(struct dp_soc *soc)
 	if (!soc->ast_hash.mask)
 		return;
 
+	if (!soc->ast_hash.bins)
+		return;
+
 	qdf_spin_lock_bh(&soc->ast_lock);
 	for (index = 0; index <= soc->ast_hash.mask; index++) {
 		if (!TAILQ_EMPTY(&soc->ast_hash.bins[index])) {
@@ -304,6 +310,7 @@ static void dp_peer_ast_hash_detach(struct dp_soc *soc)
 	qdf_spin_unlock_bh(&soc->ast_lock);
 
 	qdf_mem_free(soc->ast_hash.bins);
+	soc->ast_hash.bins = NULL;
 }
 
 /*
@@ -1200,12 +1207,18 @@ void dp_peer_find_hash_erase(struct dp_soc *soc)
 
 static void dp_peer_ast_table_detach(struct dp_soc *soc)
 {
-	qdf_mem_free(soc->ast_table);
+	if (soc->ast_table) {
+		qdf_mem_free(soc->ast_table);
+		soc->ast_table = NULL;
+	}
 }
 
 static void dp_peer_find_map_detach(struct dp_soc *soc)
 {
-	qdf_mem_free(soc->peer_id_to_obj_map);
+	if (soc->peer_id_to_obj_map) {
+		qdf_mem_free(soc->peer_id_to_obj_map);
+		soc->peer_id_to_obj_map = NULL;
+	}
 }
 
 int dp_peer_find_attach(struct dp_soc *soc)