tests: fix compiler error

[giuseppe]

the build fails on RHEL 8 with:

tests/tests_libcrun_fuzzer.c: In function 'sig_chld': tests/tests_libcrun_fuzzer.c:466:11: error: parameter name omitted
sig_chld (int)
^~~
make: *** [Makefile:2684: tests/tests_libcrun_fuzzer-tests_libcrun_fuzzer.o] Error 1

Summary by Sourcery

Tests:

• Name the sig_chld function parameter and annotate it with arg_unused in tests/tests_libcrun_fuzzer.c to satisfy the compiler.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Fix compiler error in tests by specifying the missing parameter name and marking it unused in the sig_chld handler definition.

File-Level Changes

Change	Details	Files
Specify and annotate the missing function parameter in sig_chld	Renamed the unnamed int parameter to 'sig' Added 'arg_unused' annotation to the parameter	tests/tests_libcrun_fuzzer.c

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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[kolyshkin]

lgtm