tests: Specify VK_BUFFER_USAGE_TRANSFER_SOURCE_BIT on buffer used to copy from
diff --git a/tests/vktestframework.cpp b/tests/vktestframework.cpp
index ed2706a..ffb2549 100644
--- a/tests/vktestframework.cpp
+++ b/tests/vktestframework.cpp
@@ -461,6 +461,7 @@
     }
 
     VkMemoryPropertyFlags flags = VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT;
+    flags |= VK_BUFFER_USAGE_TRANSFER_SOURCE_BIT;
     buf.init(m_device, (VkDeviceSize)m_display_image->m_data_size, flags);
     dest_ptr = buf.map();
     memcpy(dest_ptr, m_display_image->m_data, m_display_image->m_data_size);