stasis_message.c: Don't create immutable stasis objects with locks.

* Create the stasis message object without a lock as it is immutable.
* Create the stasis message type object without a lock as it is immutable.
* Creating the stasis message type could crash if the passed in type name
is NULL and REF_DEBUG is enabled.  Added missing NULL check when passing
the ao2 object tag string.

Change-Id: I28763c58bb9f0b427c11971d0103bf94055e7b32

main/stasis_message.c

@@ -63,7 +63,8 @@ int stasis_message_type_create(const char *name,
 		return STASIS_MESSAGE_TYPE_DECLINED;
 	}
 
-	type = ao2_t_alloc(sizeof(*type), message_type_dtor, name);
+	type = ao2_t_alloc_options(sizeof(*type), message_type_dtor,
+		AO2_ALLOC_OPT_LOCK_NOLOCK, name ?: "");
 	if (!type) {
 		return STASIS_MESSAGE_TYPE_ERROR;
 	}
@@ -123,7 +124,8 @@ struct stasis_message *stasis_message_create_full(struct stasis_message_type *ty
 		return NULL;
 	}
 
-	message = ao2_t_alloc(sizeof(*message), stasis_message_dtor, type->name);
+	message = ao2_t_alloc_options(sizeof(*message), stasis_message_dtor,
+		AO2_ALLOC_OPT_LOCK_NOLOCK, type->name);
 	if (message == NULL) {
 		return NULL;
 	}