fix compiler warnings - exchange - Base system with REST service to issue digital coins, run by the payment service provider

commit 325aaddbd6612c3baa56d01f6777faf77d082588
parent 2696688aa31bd058ebff6610660d7e6d607c6e50
Author: Christian Grothoff <christian@grothoff.org>
Date:   Tue, 29 Oct 2019 20:58:18 +0100

fix compiler warnings

	exchange Base system with REST service to issue digital coins, run by the payment service provider
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