time/kunit: Document handling of negative years of is_leap()

The code local is_leap() helper was tried to be replaced by the RTC
is_leap_year() function. Unfortunately the two aren't exactly equivalent,
as the kunit variant uses a signed value for the year and the RTC an
unsigned one.

Since the KUnit tests cover a 16000 year range around the epoch they use
year values that are very comfortably negative and hence get mishandled
when passed into is_leap_year().

The change was reverted, so add a comment which prevents further attempts
to do so.

[ tglx: Adapted to the revert ]

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260130-kunit-fix-leap-year-v1-1-92ddf55dffd7@kernel.org

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