qemu-file: simplify and export qemu_ftell
Force a flush when qemu_ftell is called. This simplifies the buffer magic (it also breaks qemu_ftell for input QEMUFiles, but we never use it). Reviewed-by: NOrit Wasserman <owasserm@redhat.com> Reviewed-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NJuan Quintela <quintela@redhat.com>
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