Fix the following coccicheck review:
./drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c:1174:14-18
:Unneeded variable
Remove unneeded variable used to store return value.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: ran jianping <ran.jianping@zte.com.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
                                   enum smu_clk_type clk_type, uint32_t mask)
 {
        struct amdgpu_device *adev = smu->adev;
-       int ret = 0, size = 0;
+       int ret = 0;
        uint32_t soft_min_level = 0, soft_max_level = 0, min_freq = 0, max_freq = 0;
 
        soft_min_level = mask ? (ffs(mask) - 1) : 0;
        if ((clk_type == SMU_GFXCLK) || (clk_type == SMU_SCLK))
                amdgpu_gfx_off_ctrl(adev, true);
 
-       return size;
+       return 0;
 }
 
 static int sienna_cichlid_populate_umd_state_clk(struct smu_context *smu)