Fixes coccicheck warning:

drivers/gpu/drm/amd/powerplay/hwmgr/smu10_hwmgr.c:1154:5-11: Unneeded variable: "result". Return "0" on line 1159
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: Nzhengbin <zhengbin13@huawei.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>