opp: remove WARN when no valid OPPs remain
[ Upstream commit 335ffab3 ] This WARN can be triggered per-core and the stack trace is not useful. Replace it with plain dev_err(). Fix a comment while at it. Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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