Fix state query for DEPTH_STENCIL attachment properties Add missing negation to validate the existence of a DEPTH_STENCIL attachment correctly. BUG=angleproject:1101 TEST=dEQP-GLES3.functional.state_query.fbo.framebuffer_attachment_x_size_rbo, dEQP-GLES3.functional.negative_api.state.get_framebuffer_attachment_parameteriv Change-Id: I278875684fdff562d16faba9a7eca0aa83bf80e9 Reviewed-on: https://chromium-review.googlesource.com/329867 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>