k_sleep: Invalid return value when using absolute timeout.

[micwurm]

When invoking k_sleep() with an absolute timeout, the return value is garbage.

	retVal = k_sleep(K_TIMEOUT_ABS_TICKS(targetTicks));
	endTicks = k_uptime_ticks();

In the end, targetTicks == endTicks (as expected), but retVal != 0 (should be 0).
See also: #32499
The problem is that z_tick_sleep() doesn't handle the case of absolute timeouts when computing expected_wakeup_ticks.
(Maybe z_add_timeout() should return ticks to avoid duplication?)

[github-actions]

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