samples/damon/mtier: stop all contexts with single damon_stop() call

damon_stop() was theoretically able to return failure while keeping the
second context for mtier running.  mtier stops its contexts one by one
with two damon_stop() call for the reason.  damon_stop() is refactored to
always successfully stop all requested DAMON contexts.  The two calls are
unnecessary.  Use only single damon_stop() call for all contexts.

Link: https://lore.kernel.org/20260706140628.87414-9-sj@kernel.org
Signed-off-by: SJ Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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