XMS 0fH: Resize Extended Memory Block

                                                     Compatibility: XMS 2.0+ 
 Expects: AH    0fH
          BX    desired new size, in K-bytes
          DX    XMS handle (as obtained via XMS 09H) must be unlocked
 Returns: AX    status: 0000H = successful
                        0001H = error and BL=XMS error code (if BL >= 80H)
    Info: This fn resizes an extended memory block previously allocated via
          XMS 09H (allocate XMB).

          The block must not be locked when this is called (XMS 0cH).

          When decreasing the size, any data beyond the end of the new
          block-length becomes invalid.

          A "grow" request may fail because of memory fragmentation caused
          by locked blocks.  You can try unlocking all of your XMBs and
          retry the grow request.

See Also: XMS Functions
          Extended Memory Specification (XMS)
          DOS Functions