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INT 31 - DPMI 0.9 API - protected mode - FREE DOS MEMORY BLOCK
        AX = 0101h
        DX = selector of block
Return: CF set on error
            AX = DOS error code (07h,09h) (see INT 21/AH=59h)
        CF set if successful
SeeAlso: AX=0100h,AX=0102h,AX=0502h
Note:   all descriptors allocated for the block are automatically freed