NAME
	FreeBitMap -- free a bitmap created by AllocBitMap (V39)

   SYNOPSIS
	FreeBitMap(bm)
	           a0

	VOID FreeBitMap(struct BitMap *)

   FUNCTION
	Frees bitmap and all associated bitplanes

   INPUTS
	bm  =  A pointer to a BitMap structure. Passing a NULL-pointer
	       (meaning "do nothing") is OK.

   BUGS

   NOTES
	Be careful to insure that any rendering done to the bitmap has
	completed (by calling WaitBlit()) before you call this function.

   SEE ALSO
	AllocBitMap()