test-utils: Add mctp_binding_test_destroy()

Provide an abstraction to clean up memory to avoid false-positives with
leak sanitizers.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Id62f0552f40cb2215be4b5fe9e87eb4048832ef0
diff --git a/tests/test-utils.h b/tests/test-utils.h
index 966a2df..e8c74f1 100644
--- a/tests/test-utils.h
+++ b/tests/test-utils.h
@@ -14,6 +14,7 @@
 
 /* standard binding interface */
 struct mctp_binding_test *mctp_binding_test_init(void);
+void mctp_binding_test_destroy(struct mctp_binding_test *test);
 void mctp_binding_test_register_bus(struct mctp_binding_test *binding,
 		struct mctp *mctp, mctp_eid_t eid);