contrib: format contrib files

[giuseppe]

Summary by Sourcery

Reformat contrib C files for consistent code style and extend clang-format target to include contrib directory

Enhancements:

• Apply consistent spacing and indentation in contrib/terminal-receiver, contrib/notify-socket-server, and contrib/seccomp-receiver C sources

Build:

• Include contrib directory in Makefile clang-format target

[sourcery-ai]

Reviewer's Guide

This PR applies consistent formatting to contrib C source files—restructuring the error macro, standardizing whitespace around function calls and operators, trimming trailing spaces, and updating the Makefile.am clang-format target to include the contrib directory.

File-Level Changes

Change	Details	Files
Reformatted the error macro definitions	Expanded and indented the do/while block uniformly Standardized spacing around errno checks and exit calls	contrib/terminal-receiver/terminal-receiver.c contrib/notify-socket-server/notify-socket-server.c contrib/seccomp-receiver/seccomp-receiver.c
Standardized whitespace around function calls and operators	Added spaces inside parentheses for calls to write, read, printf, fcntl, etc. Inserted spaces around bitwise OR operators in socket and recvmsg flags	contrib/terminal-receiver/terminal-receiver.c contrib/notify-socket-server/notify-socket-server.c
Removed trailing whitespace and aligned indentation	Deleted superfluous spaces and blank lines Aligned braces and code blocks to match style guidelines	contrib/terminal-receiver/terminal-receiver.c contrib/seccomp-receiver/seccomp-receiver.c
Extended clang-format target in Makefile.am	Included contrib directory in git ls-files for C/headers formatting	Makefile.am

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[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• The error macro parameter named errno shadows the global errno variable—consider renaming it (e.g. errnum) to avoid confusion.
• Manual spacing adjustments (e.g. if (! errno) vs if (!errno)) are inconsistent—either align with the existing style guide or drive these changes through a shared clang-format configuration.
• The updated Makefile.am now includes contrib in the clang-format target; you may want to run make format on all contrib sources to ensure full consistency.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- The error macro parameter named `errno` shadows the global errno variable—consider renaming it (e.g. `errnum`) to avoid confusion.
- Manual spacing adjustments (e.g. `if (! errno)` vs `if (!errno)`) are inconsistent—either align with the existing style guide or drive these changes through a shared clang-format configuration.
- The updated `Makefile.am` now includes `contrib` in the clang-format target; you may want to run `make format` on all contrib sources to ensure full consistency.

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[flouthoc]

LGTM