This fixes a regression introduced by !462 which breaks some GLES3 and
GLES31 dEQP tests.
Fixes: 1b51495 ("vrend: replace if-chain by using switch/case")
Signed-off-by: Lepton Wu <lepton@chromium.org>
Reviewed-by: Gert Wollny <gert.wollny@collabora.com>