Small fixes

Author: RossBrunton

offload/unittests/OffloadAPI/device/olGetDeviceInfo.cpp

@@ -81,9 +81,9 @@ TEST_P(olGetDeviceInfoTest, SuccessMaxWorkGroupSize) {
   ol_dimensions_t Value{0, 0, 0};
   ASSERT_SUCCESS(olGetDeviceInfo(Device, OL_DEVICE_INFO_MAX_WORK_GROUP_SIZE,
                                  sizeof(Value), &Value));
-  ASSERT_GT(Value.x, 0);
-  ASSERT_GT(Value.y, 0);
-  ASSERT_GT(Value.z, 0);
+  ASSERT_GT(Value.x, 0u);
+  ASSERT_GT(Value.y, 0u);
+  ASSERT_GT(Value.z, 0u);
 }
 
 TEST_P(olGetDeviceInfoTest, InvalidNullHandleDevice) {