git: openjdk/mobile: 8243941: build issue introduced with the push of 8242237

[duke]

Changeset: ae9d5636
Author:    Serguei Spitsyn <sspitsyn at openjdk.org>
Date:      2020-04-28 04:46:08 +0000
URL:       https://git.openjdk.java.net/mobile/commit/ae9d5636

8243941: build issue introduced with the push of 8242237

Use right type to declare function argument

Reviewed-by: iignatyev

! test/hotspot/jtreg/serviceability/jvmti/HiddenClass/libHiddenClassSigTest.cpp