Restyle fix: Ensure we have allocators available for the error paths.

[restyled-io]

A duplicate of #2408 with additional commits that automatically address
incorrect style, created by Restyled.

Since the original Pull Request was opened as a fork in a contributor's
repository, we are unable to create a Pull Request branching from it with only
the style fixes.

The following Restylers made fixes:

• black
• yapf

To incorporate these changes, you can either:

1. Merge this Pull Request instead of the original, or

2. Ask your contributor to locally incorporate these commits and push them to
   the original Pull Request

   Expand for example instructions

   ```console
   git remote add upstream https://github.com/TokTok/c-toxcore.git
   git fetch upstream pull/<this PR number>/head
   git merge --ff-only FETCH_HEAD
   git push
   ```
   

NOTE: As work continues on the original Pull Request, this process will
re-run and update (force-push) this Pull Request with updated style fixes as
necessary. If the style is fixed manually at any point (i.e. this process finds
no fixes to make), this Pull Request will be closed automatically.

Sorry if this was unexpected. To disable it, see our documentation.

---

This change is 

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.15% ⚠️

Comparison is base (0cef46e) 74.66% compared to head (234b336) 74.52%.

❗ Current head 234b336 differs from pull request most recent head f729b7f. Consider uploading reports for the commit f729b7f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2409      +/-   ##
==========================================
- Coverage   74.66%   74.52%   -0.15%     
==========================================
  Files          87       87              
  Lines       26190    26192       +2     
==========================================
- Hits        19555    19519      -36     
- Misses       6635     6673      +38     

Files Changed	Coverage Δ
toxcore/group_chats.c	69.96% <100.00%> (-0.60%)	⬇️
toxcore/network.c	86.09% <100.00%> (ø)

... and 8 files with indirect coverage changes

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