MT#55283 prevent use of global rtpe_arena

Change-Id: I36c04a82ef5b42cda71ab9a3d3f656a9601a05d5

daemon/call.c

@@ -5502,6 +5502,8 @@ static void __call_free(call_t *c) {
 
 	//ilog(LOG_DEBUG, "freeing main call struct");
 
+	memory_arena = &c->buffer;
+
 	call_checkpoint_free_all(c);
 	obj_release(c->dtls_cert);
 	mqtt_timer_stop(&c->mqtt_timer);
@@ -5538,7 +5540,9 @@ static void __call_free(call_t *c) {
 		bufferpool_unref(ps->stats_out);
 	}
 
+	memory_arena = NULL;
 	arena_free(&c->buffer);
+
 	ice_fragments_cleanup(c->sdp_fragments, true);
 	t_hash_table_destroy(c->sdp_fragments);
 	rwlock_destroy(&c->master_lock);

include/call.h

@@ -1059,7 +1059,7 @@ INLINE void call_memory_arena_release(void) {
 		return;
 	obj_put(call_memory_arena);
 	call_memory_arena = NULL;
-	memory_arena = &rtpe_arena;
+	memory_arena = NULL;
 }
 INLINE void call_memory_arena_set(call_t *c) {
 	call_memory_arena_release();