drm/msm: Remove unneeded variable: "rc"

Remove unneeded variable: "rc".

Signed-off-by: zuoqilin <zuoqilin@yulong.com>
Link: https://lore.kernel.org/r/20210318032422.1285-1-zuoqilin1@163.com


Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>