v1.14: Fix keygen usb panic (debug only) (backport of #31194)

[mergify]

This is an automatic backport of pull request #31194 done by Mergify.
Cherry-pick of 2147f0d has failed:

On branch mergify/bp/v1.14/pr-31194
Your branch is up to date with 'origin/v1.14'.

You are currently cherry-picking commit 2147f0d05.
  (fix conflicts and run "git cherry-pick --continue")
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Changes to be committed:
	modified:   clap-v3-utils/src/keypair.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   Cargo.lock
	both modified:   clap-v3-utils/Cargo.toml

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[CriesofCarrots]

I'm requesting backport on this because the bug was introduced in v1.14 (v1.11, really). But I don't feel that strongly about it.