drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c: Remove unneeded semicolon

fix semicolon.cocci warnings:
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c:752:2-3: Unneeded semicolon

Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
Signed-off-by: Rob Clark <robdclark@chromium.org>