Merge "Check for ao2_alloc failure in __ast_channel_internal_alloc." into 13

main/channel_internal_api.c

@@ -1457,6 +1457,10 @@ struct ast_channel *__ast_channel_internal_alloc(void (*destructor)(void *obj),
 	tmp = ao2_alloc(sizeof(*tmp), destructor);
 #endif
 
+	if (!tmp) {
+		return NULL;
+	}
+
 	if ((ast_string_field_init(tmp, 128))) {
 		return ast_channel_unref(tmp);
 	}