NAME
        UnlockLayerRom -- Unlock layer structure by rom(gfx lib) code.

   SYNOPSIS
        UnlockLayerRom( layer )
                         a5

        void UnlockLayerRom( struct layer * );

   FUNCTION
        Release the lock on this layer. If the same task has called
        locklayerrom more than once than the same number of calls to
        UnlockLayerRom must happen before the layer is actually freed
        so that other tasks may use it.
        This call does destroy scratch registers.
        This call is identical to unlocklayer (layers.library).

   INPUTS
        layer - pointer to layer structure

   BUGS

   SEE ALSO
        locklayerrom() layers.library/unlocklayer() graphics/clip.h