blockdev: drop unnecessary DriveBackupState field assignment
drive_backup_prepare() assigns DriveBackupState fields to NULL in the error path. This is unnecessary because the DriveBackupState is allocated using g_malloc0() and other functions like external_snapshot_prepare() already rely on this. Do not explicitly assign fields to NULL so that the error path is concise and does not require modification when fields are added to DriveBackupState. Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Reviewed-by: NMax Reitz <mreitz@redhat.com> Message-id: 1416566940-4430-3-git-send-email-stefanha@redhat.com Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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