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backup-mysql: ensure rm path never expands to /*

Closed Sven-Hendrik Haase requested to merge make-sure-unset-variable-doesnt-delete-root into master
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@@ -4,5 +4,5 @@ mysql_opts="--defaults-file={{mysql_backup_defaults}}"
backupdir="{{mysql_backup_dir}}"
[[ ! -d "$backupdir" ]] && mkdir -p "$backupdir"
rm -rf "$backupdir"/*
rm -rf "${backupdir:?}"/*
mariabackup $mysql_opts --backup --target-dir="$backupdir"
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