drm/dsi: Make mipi_dsi_dcs_write() return ssize_t
This function returns the value of the struct mipi_dsi_host_ops' .transfer() so make sure the return types are consistent. Acked-by: Andrzej Hajda <a.hajda@samsung.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
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