ftp: Solve possible race condition

[IngelaAndin]

Closes #8454

[github-actions[bot]]

CT Test Results

  2 files   13 suites   5m 3s :stopwatch: 145 tests 141 :white_check_mark:  4 :zzz: 0 :x: 205 runs  193 :white_check_mark: 12 :zzz: 0 :x:

Results for commit d96333d3.

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// Erlang/OTP Github Action Bot

[u3s]

Closes #8538

Is this correct issue number?

No, fixed to #8454