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     The hfree function deallocates a memory block; the freed memory is
     returned to the operating system. The <memblock> argument points
     to a memory block previously allocated through a call to halloc.
     The number of bytes freed is the number of bytes specified when
     the block was allocated.
 
     Note that attempting to free an invalid <memblock> argument (one
     not allocated with halloc) may affect subsequent allocation and
     cause errors.
 
     Return Value
 
     None.
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