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Document the behavior of fw_cfg_modify_iXX() for leak-less updating of integer-type blobs. Currently only fw_cfg_modify_i16() is coded, but 32- and 64-bit versions may be added later if necessary.. Signed-off-by: Gabriel Somlo <somlo@cmu.edu> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>