NAME
        UnlockLayer -- Unlock layer and allow graphics routines to use it.

    SYNOPSIS
        UnlockLayer( l )
                     a0

        void UnlockLayer( struct layer *);

    FUNCTION
        When finished changing the ClipRects or whatever you were
        doing with this layer you must call UnlockLayer() to allow
        other tasks to proceed with graphic output to the layer.

    INPUTS
        l - pointer to a layer

    BUGS

    SEE ALSO
        graphics/layers.h, graphics/clip.h