drm/radeon/ni_dpm: remove redundant NULL check

'leakage_table' will always be successfully initialized as a pointer
to '&rdev->pm.dpm.dyn_state.cac_leakage_table'.

Remove unnecessary check if only to silence static checkers.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool Svace.

Fixes: 69e0b57a ("drm/radeon/kms: add dpm support for cayman (v5)")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/ni_dpm.c

@@ -3103,9 +3103,6 @@ static int ni_init_simplified_leakage_table(struct radeon_device *rdev,
 	u32 smc_leakage, max_leakage = 0;
 	u32 scaling_factor;
 
-	if (!leakage_table)
-		return -EINVAL;
-
 	table_size = leakage_table->count;
 
 	if (eg_pi->vddc_voltage_table.count != table_size)