NAME
	UnLoadSeg -- Unload a seglist previously loaded by  LoadSeg()

    SYNOPSIS
	success = UnLoadSeg( seglist )
	D0		       D1

	 BOOL UnLoadSeg( BPTR)

    FUNCTION
	Unload a seglist loaded by  LoadSeg().  'seglist' may be zero.
	Overlaid segments will have all needed cleanup done, including
	closing files.

    INPUTS
	seglist - BCPL pointer to a segment identifier

    RESULTS
	success - returns 0 if a NULL seglist was passed or if it failed
		  to close an overlay file.  NOTE: this function returned
		  a random value before V36!

    SEE ALSO
	 LoadSeg(),  InternalLoadSeg(),  InternalUnLoadSeg()