color-lcms: Fix memory leak in join_curvesets
LCMS API cmsStageAllocToneCurves uses cmsDupToneCurve which internally re-allocates a new table of points. As a result, we have to free the old table returned from lcmsJoinToneCurve.
Signed-off-by: Vitaly Prosyak vitaly.prosyak@amd.com