selftests: timers: nanosleep: Explicitly handle timer_delete() failure

An upcoming patch will remove the early exit on failure of a single
testcase. If a test fails because a timeout timer could not be deleted,
then that timeout timer might interfere with the following tettcases.

Exit the whole test case with a clear error message in this case.

Other failures are not problematic:
* If timer_settime() fails, a harmless unarmed timer is left around.
* The SIGALRM handler reconfigured for each call to
  nanosleep_test_remaining() anyways.

Signed-off-by: Thomas Weißschuh (Schneider Electric) <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260803-auxclock-nanosleep-prep-v2-12-910cbd485390@linutronix.de

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