drm/amd/pm: Remove unneeded semicolon

./drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c:1418:2-3: Unneeded semicolon

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7743


Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>