pmdomain: qcom: rpmpd: fix off-by-one error in clamping to the highest state

pmdomain: qcom: rpmpd: fix off-by-one error in clamping to the highest state

As it is indicated by the comment, the rpmpd_aggregate_corner() function
tries to clamp the state to the highest corner/level supported by the
given power domain, however the calculation of the highest state contains
an off-by-one error.

The 'max_state' member of the 'rpmpd' structure indicates the highest
corner/level, and as such it does not needs to be decremented.

Change the code to use the 'max_state' value directly to avoid the error.

Fixes: 98c8b3efacae ("soc: qcom: rpmpd: Add sync_state")
Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>