drm/radeon: Use DIV_ROUND_UP()
Use DIV_ROUND_UP() instead of hand rolling it. Just a drive-by change. Cc: Alex Deucher <alexander.deucher@amd.com> Cc: "Christian König" <christian.koenig@amd.com> Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com> Link: http://patchwork.freedesktop.org/patch/msgid/1479498793-31021-4-git-send-email-ville.syrjala@linux.intel.com
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