drm/amd/pm/powerplay/kv_dpm: Remove unused variable 'ret'

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/kv_dpm.c: In function ‘kv_dpm_powergate_uvd’:
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/kv_dpm.c:1678:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/kv_dpm.c: In function ‘kv_dpm_powergate_vce’:
 drivers/gpu/drm/amd/amdgpu/../pm/powerplay/kv_dpm.c:1706:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]

Cc: Evan Quan <evan.quan@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/powerplay/kv_dpm.c

@@ -1675,13 +1675,12 @@ static void kv_dpm_powergate_uvd(void *handle, bool gate)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 	struct kv_power_info *pi = kv_get_pi(adev);
-	int ret;
 
 	pi->uvd_power_gated = gate;
 
 	if (gate) {
 		/* stop the UVD block */
-		ret = amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_UVD,
+		amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_UVD,
 						       AMD_PG_STATE_GATE);
 		kv_update_uvd_dpm(adev, gate);
 		if (pi->caps_uvd_pg)
@@ -1694,7 +1693,7 @@ static void kv_dpm_powergate_uvd(void *handle, bool gate)
 			/* re-init the UVD block */
 		kv_update_uvd_dpm(adev, gate);
 
-		ret = amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_UVD,
+		amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_UVD,
 						       AMD_PG_STATE_UNGATE);
 	}
 }
@@ -1703,13 +1702,12 @@ static void kv_dpm_powergate_vce(void *handle, bool gate)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 	struct kv_power_info *pi = kv_get_pi(adev);
-	int ret;
 
 	pi->vce_power_gated = gate;
 
 	if (gate) {
 		/* stop the VCE block */
-		ret = amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCE,
+		amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCE,
 						       AMD_PG_STATE_GATE);
 		kv_enable_vce_dpm(adev, false);
 		if (pi->caps_vce_pg) /* power off the VCE block */
@@ -1719,7 +1717,7 @@ static void kv_dpm_powergate_vce(void *handle, bool gate)
 			amdgpu_kv_notify_message_to_smu(adev, PPSMC_MSG_VCEPowerON);
 		kv_enable_vce_dpm(adev, true);
 		/* re-init the VCE block */
-		ret = amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCE,
+		amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCE,
 						       AMD_PG_STATE_UNGATE);
 	}
 }