NAME
        UnlockLayerInfo -- Unlock the LayerInfo structure.

    SYNOPSIS
        UnlockLayerInfo( li )
                         a0

        void UnlockLayerInfo( struct layer_info *);

    FUNCTION
        After the operation is complete that required a locklayerinfo,
        unlock the LayerInfo structure so that  other tasks may
        affect the layers.

    INPUTS
        li - pointer to the layer_info structure

     BUGS

     SEE ALSO
        locklayerinfo(), graphics/layers.h