drm: fb-helper: Reject all pixel format changing requests
drm fbdev emulation doesn't support changing the pixel format at all, so reject all pixel format changing requests. Cc: stable@vger.kernel.org Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20181003164538.5534-1-Eugeniy.Paltsev@synopsys.com
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