[ Upstream commit 09f662f95306f3e3d47ab6842bc4b0bb868a80ad ]
Return error number instead of 0 on failures.
Fixes: a1e8c13600 ("PM / OPP: "opp-hz" is optional for power domains")
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>