Zero initialize array in internal tests
Zero initialize array in internal tests

This suppresses a -Wmaybe-uninitialized warning in GCC 11 release
builds.

Affects: dE-IT.delibs.decpp.block_buffer

Components: Framework

VK-GL-CTS issue: 3378

Change-Id: I2315b5cdeecb6e9a54dd419c88134f30a3335029

KhronosGroup/Vulkan-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/Vulkan-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS,KhronosGroup/VK-GL-CTS