drm/radeon: remove redundant assignment to variable ret

The variable ret is being initialized with a value that is never
read and it is being updated later with a new value. The
initialization is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/si_dpm.c

@@ -5899,7 +5899,7 @@ static int si_patch_single_dependency_table_based_on_leakage(struct radeon_devic
 
 static int si_patch_dependency_tables_based_on_leakage(struct radeon_device *rdev)
 {
-	int ret = 0;
+	int ret;
 
 	ret = si_patch_single_dependency_table_based_on_leakage(rdev,
 								&rdev->pm.dpm.dyn_state.vddc_dependency_on_sclk);