[warnings] Remove unused function definition

[AdamCmiel]

First time contributor checklist

• [x] I have read the README and CONTRIBUTING documents
• [x] I have signed the Contributor Licence Agreement

Contributor checklist

• [x] My commits are rebased on the latest main branch
• [x] My commits are in nice logical chunks
• [x] My contribution is fully baked and is ready to be merged as is
• [x] I have tested my contribution on these devices:
  • Compiled on Xcode 14.2, removes warning

• ---

Description

It looks like the last invocation of SSKEnsureError was removed in this commit. Remove the unused function definition.

[stale[bot]]

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[stale[bot]]

This issue has been closed due to inactivity.