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Description of problem:
We backported support for "-" prefixed keys in sysctl.d snippets, however, we still warn about errors even for keys that are prefixed. We should ignore such errors and not print warning.

Version-Release number of selected component (if applicable):
systemd-239-69.el8.x86_64

How reproducible:
deterministic

Steps to Reproduce:
1.
cat >/tmp/sysctl-foo.conf <<"EOF"
kernel.foo = 1
EOF

cat >/tmp/sysctl-foo-ignore.conf <<"EOF"
-kernel.foo = 1
EOF

2. /usr/lib/systemd/systemd-sysctl /tmp/sysctl-foo.conf
3. /usr/lib/systemd/systemd-sysctl /tmp/sysctl-foo-ignore.conf

Actual results:
"Couldn't write '1' to 'kernel/foo', ignoring: No such file or directory" is printed in both cases.

Expected results:
Error message should be printed only after executing 2).

Additional info:
https://github.com/systemd/systemd/commit/32458cc9687c1b60ff0f22c0e71da93ce78b1534

fix merged to github main branch -> https://github.com/redhat-plumbers/systemd-rhel8/pull/348

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (systemd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:2985