swsmu/amdgpu_smu: Fix the wrong if-condition

The logical operator '&&' will make
smu->ppt_funcs->set_gfx_power_up_by_imu segment fault when
smu->ppt_funcs is NULL.
Signed-off-by: Yu Songping <yusongping@huawei.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c

@@ -161,7 +161,7 @@ int smu_get_dpm_freq_range(struct smu_context *smu,
 
 int smu_set_gfx_power_up_by_imu(struct smu_context *smu)
 {
-	if (!smu->ppt_funcs && !smu->ppt_funcs->set_gfx_power_up_by_imu)
+	if (!smu->ppt_funcs || !smu->ppt_funcs->set_gfx_power_up_by_imu)
 		return -EOPNOTSUPP;
 
 	return smu->ppt_funcs->set_gfx_power_up_by_imu(smu);