qemu: Rename xml_len in virQEMUSaveHeader as data_len
Since virQEMUSaveHeader will be followed by more than just domain XML, the old name would be confusing as it was designed to describe the length of all data following the save image header. Signed-off-by: NJiri Denemark <jdenemar@redhat.com> Reviewed-by: NPavel Hrdina <phrdina@redhat.com>
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